Birnessite
A valid IMA mineral species - grandfathered
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About Birnessite
Formula:
(Na,Ca)0.5(Mn4+,Mn3+)2O4 · 1.5H2O
Colour:
Black; dark brown in transmitted light
Lustre:
Sub-Vitreous, Resinous, Waxy, Sub-Metallic, Dull, Earthy
Hardness:
1½
Specific Gravity:
3
Crystal System:
Monoclinic
Member of:
Name:
Named in 1956 by Lloyd Hugh Parker Jones and Angela Alice Milne for the type locality at Birness, Scotland, UK. Earlier called "manganous manganite" by McMurdie (1944).
Type Locality:
Isostructural with:
Generally massive, either earthy or as a resinous to dull fine-grained deposit. Sometime is a replacing material of manganese minerals, including silicates. Occurs in some manganese oxide dendrites. Rarely as dark brown needle crystals.
See also vernadite.
Many manganese oxides are better identified using infra-red spectroscopy than by x-ray diffraction because of issues of crystal size, disorder, etc. (Potter and Rossman, 1979).
Compare 'UM1979-06-O:CaHMn' (reported as the Ca analogue, but structurally different).
May mineralize fungal (Alternaria spp., Cladosporium spp.) hyphae, as known from a siderite boulder and from a soil (vide Burford et al., 2003).
See also vernadite.
Many manganese oxides are better identified using infra-red spectroscopy than by x-ray diffraction because of issues of crystal size, disorder, etc. (Potter and Rossman, 1979).
Compare 'UM1979-06-O:CaHMn' (reported as the Ca analogue, but structurally different).
May mineralize fungal (Alternaria spp., Cladosporium spp.) hyphae, as known from a siderite boulder and from a soil (vide Burford et al., 2003).
Unique Identifiers
Mindat ID:
680
Long-form identifier:
mindat:1:1:680:6
GUID
(UUID V4):
(UUID V4):
a748d30f-abce-4e6a-b5b3-8734d68f41ab
IMA Classification of Birnessite
Approved, 'Grandfathered' (first described prior to 1959)
IMA Formula:
(Na,Ca,K)0.6(Mn4+,Mn3+)2O4 · 1.5H2O
First published:
1956
Classification of Birnessite
4.FL.45
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
F : Hydroxides (without V or U)
L : Hydroxides with H2O +- (OH); sheets of edge-sharing octahedra
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
F : Hydroxides (without V or U)
L : Hydroxides with H2O +- (OH); sheets of edge-sharing octahedra
7.5.3.1
7 : MULTIPLE OXIDES
5 : (AB)2X3
7 : MULTIPLE OXIDES
5 : (AB)2X3
7.18.11
7 : Oxides and Hydroxides
18 : Oxides of Mn
7 : Oxides and Hydroxides
18 : Oxides of Mn
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.
Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.
| Symbol | Source | Reference |
|---|---|---|
| Bir | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
| Bir | Warr (2020) | Warr, L.N. (2020) Recommended abbreviations for the names of clay minerals and associated phases. Clay Minerals, 55, 261–264 doi:10.1180/clm.2020.30 |
Physical Properties of Birnessite
Sub-Vitreous, Resinous, Waxy, Sub-Metallic, Dull, Earthy
Transparency:
Opaque
Comment:
Usually fine-grained massive
Colour:
Black; dark brown in transmitted light
Streak:
Dark brown to brown
Hardness:
1½ on Mohs scale
Tenacity:
Brittle
Density:
3 g/cm3 (Measured) 3.4 g/cm3 (Calculated)
Comment:
Usually earthy
Optical Data of Birnessite
Type:
Uniaxial (-)
RI values:
nω = 1.730 nε = 1.690
Birefringence:
0.040
Max Birefringence:
δ = 0.040
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
High
Dispersion:
weak to moderate
Optical Extinction:
Parallel. Refractive indices not far from pyrochroite.
Comments:
The mineral is pseudo-uniaxial (-); an identification by optical properties is impossible.
Chemistry of Birnessite
Mindat Formula:
(Na,Ca)0.5(Mn4+,Mn3+)2O4 · 1.5H2O
Common Impurities:
Cl,Co,Cu,Fe,K,Ni,Mg,S,Si
Crystallography of Birnessite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/m
Setting:
C2/m
Cell Parameters:
a = 5.175 Å, b = 2.850 Å, c = 7.337 Å
β = 103.18°
β = 103.18°
Ratio:
a:b:c = 1.816 : 1 : 2.574
Unit Cell V:
105.36 ų (Calculated from Unit Cell)
Z:
1
Morphology:
Rarely in platelets, to 50 µm; commonly extremely finely crystalline, spherulitic, cellular. Rarely as divergent sprays of acicular crystals.
Comment:
Z also given as 0.5
Crystal Structure
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0001300 | Birnessite | Post J E, Veblen D R (1990) Crystal structure determinations of synthetic sodium, magnesium and potassium birnessite using TEM and the Rietveld method sample is Na-birn American Mineralogist 75 477-489 |  | 1990 | 0 | 293 | |
| 0001301 | Birnessite | Post J E, Veblen D R (1990) Crystal structure determinations of synthetic sodium, magnesium and potassium birnessite using TEM and the Rietveld method American Mineralogist 75 477-489 | | 1990 | 0 | 293 | |
| 0001302 | Birnessite | Post J E, Veblen D R (1990) Crystal structure determinations of synthetic sodium, magnesium and potassium birnessite using TEM and the Rietveld method American Mineralogist 75 477-489 | | 1990 | 0 | 293 | |
| 0002932 | Birnessite | Lanson B, Drits V A, Feng Q, Manceau A (2002) Structure of synthetic Na-rich birnessite: Evidence for a triclinic one-layer unit cell American Mineralogist 87 1662-1671 | | 2002 | 0 | 293 | |
| 0004276 | Birnessite | Lopano C L, Heaney P J, Post J E, Hanson J, Komarneni S (2007) Time-resolved structural analysis of K-and Ba-exchange reactions with synthetic Na-birnessite using synchrotron X-ray diffraction American Mineralogist 92 380-387 | | 2007 | synthetic | 0 | 293 |
| 0004277 | Birnessite | Lopano C L, Heaney P J, Post J E, Hanson J, Komarneni S (2007) Time-resolved structural analysis of K-and Ba-exchange reactions with synthetic Na-birnessite using synchrotron X-ray diffraction American Mineralogist 92 380-387 | | 2007 | synthetic | 0 | 293 |
| 0004947 | Birnessite | Lopano C L, Heaney P J, Post J E (2009) Cs-exchange in birnessite: Reaction mechanisms inferred from time-resolved X-ray diffraction and transmission electron microscopy American Mineralogist 94 816-826 | | 2009 | 0 | 293 | |
| 0004948 | Birnessite | Lopano C L, Heaney P J, Post J E (2009) Cs-exchange in birnessite: Reaction mechanisms inferred from time-resolved X-ray diffraction and transmission electron microscopy American Mineralogist 94 816-826 | | 2009 | 0 | 293 | |
| 0004949 | Birnessite | Lopano C L, Heaney P J, Post J E (2009) Cs-exchange in birnessite: Reaction mechanisms inferred from time-resolved X-ray diffraction and transmission electron microscopy American Mineralogist 94 816-826 | | 2009 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 7.08 Å | (100) |
| 3.547 Å | (28) |
| 2.468 Å | (17) |
| 2.333 Å | (43) |
| 2.031 Å | (24) |
| 1.711 Å | (29) |
| 1.426 Å | (17) |
Comments:
Birnessite frequently yields only 2-4 x-ray diffraction peaks. Data above recorded on a marine nodule from the Caribbean Sea; all reflections are typically very broad. See extensive d-value set ICDD 23-1046 (synthetic): 7.09 (100), 5.60 (10), 3.56 (80), 2.74 (10), 2.58 (10), 2.56 (10), 2.51 (70), 2.47 (10), 2.42 (60), 2.31 (10), 2.26 (10), 2.25 (10), 2.21 (40) 2.15 (40), 2.14 (40), 2.09 (10), 1.97 (10), 1.94 (10), 1.86 (40), 1.82 (40), 1.81 (40), 1.77 (20), 1.75 (10), 1.66 (20), 1.63 (20), 1.55 (10), 1.53 (10), 1.52 (10), 1.47 (60), 1.43 (50), 1.41 (40) 1.37 (20). Data from ICDD 13-105 and 18-802 have been superceded.
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| High-𝑇 alteration and/or metamorphism | |
| 32 : Ba/Mn/Pb/Zn deposits, including metamorphic deposits | |
| Stage 5: Initiation of plate tectonics | <3.5-2.5 |
| 42 : Sea-floor Mn nodules | |
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] | |
| 47e : [Vanadates, chromates, manganates] | |
| Stage 10a: Neoproterozoic oxygenation/terrestrial biosphere | <0.6 |
| 48 : Soil leaching zone minerals | <0.6 |
| 49 : Oxic cellular biomineralization (see also #44) | <0.54 |
Geological Setting:
A major manganese-bearing mineral of many soils; a common alteration product of manganese-rich mineral deposits; a component of bacterially-precipitated manganese oxides; an important constituent of "desert varnish" and marine manganese nodules.
Type Occurrence of Birnessite
General Appearance of Type Material:
Black coating or cement on pebbles.
Place of Conservation of Type Material:
No designated type material.
Geological Setting of Type Material:
Concretion in an unconsolidated glacial sedimentary deposit.
Associated Minerals at Type Locality:
Synonyms of Birnessite
Other Language Names for Birnessite
Relationship of Birnessite to other Species
Member of:
Other Members of this group:
| Ranciéite | (Ca,Mn2+)0.2(Mn4+,Mn3+)O2 · 0.6H2O | Trig. 3 : P3 |
| Takanelite | (Mn,Ca)Mn4O9 · H2O | Hex. |
Common Associates
Associated Minerals Based on Photo Data:
| 55 photos of Birnessite associated with Todorokite | (Na,Ca,K,Ba,Sr)1-x(Mn,Mg,Al)6O12 · 3-4H2O |
| 49 photos of Birnessite associated with Romanèchite | (Ba,H2O)2(Mn4+,Mn3+)5O10 |
| 21 photos of Birnessite associated with Ranciéite | (Ca,Mn2+)0.2(Mn4+,Mn3+)O2 · 0.6H2O |
| 14 photos of Birnessite associated with Calcite | CaCO3 |
| 12 photos of Birnessite associated with Serandite | NaMn2+2Si3O8(OH) |
| 10 photos of Birnessite associated with Leucophanite | NaCaBeSi2O6F |
| 10 photos of Birnessite associated with Natrolite | Na2Al2Si3O10 · 2H2O |
| 10 photos of Birnessite associated with Aegirine | NaFe3+Si2O6 |
| 9 photos of Birnessite associated with Microcline | K(AlSi3O8) |
| 6 photos of Birnessite associated with Rhodochrosite | MnCO3 |
Related Minerals - Strunz-mindat Grouping
| 4.FL. | Trébeurdenite | Fe2+2Fe3+4O2(OH)10CO3 · 3H2O |
| 4.FL. | Mariakrite | [Ca4Al2(OH)12(H2O)4][Fe2S4] |
| 4.FL.05 | Woodallite | Mg6Cr2(OH)16Cl2 · 4H2O |
| 4.FL.05 | Iowaite | Mg6Fe3+2(OH)16Cl2 · 4H2O |
| 4.FL.05 | Jamborite | Ni2+1-xCo3+x(OH)2-x(SO4)x · nH2O |
| 4.FL.05 | Meixnerite | Mg6Al2(OH)16(OH)2 · 4H2O |
| 4.FL.05 | Muskoxite | Mg7Fe4O13 · 10H2O |
| 4.FL.05 | Fougèrite | Fe2+4Fe3+2(OH)12[CO3] · 3H2O |
| 4.FL.05 | Mössbauerite | Fe3+6O4(OH)8[CO3] · 3H2O |
| 4.FL.05 | Dritsite | Li2Al4(OH)12Cl2 · 3H2O |
| 4.FL.10 | Hydrocalumite | Ca4Al2(OH)12(Cl,CO3,OH)2 · 4H2O |
| 4.FL.15 | Kuzelite | Ca4Al2(OH)12[SO4] · 6H2O |
| 4.FL.20 | Aurorite | Mn2+Mn4+3O7 · 3H2O |
| 4.FL.20 | Chalcophanite | ZnMn4+3O7 · 3H2O |
| 4.FL.20 | Ernienickelite | NiMn3O7 · 3H2O |
| 4.FL.20 | Jianshuiite | (Mg,Mn,Ca)Mn3O7 · 3H2O |
| 4.FL.25 | Woodruffite | Zn2+x/2(Mn4+1-xMn3+x)O2 · yH2O |
| 4.FL.30 | Asbolane | (Ni,Co)2-xMn4+(O,OH)4 · nH2O |
| 4.FL.30 va | Lampadite | Cu, Mn, O, H |
| 4.FL.35 | Buserite | Na4Mn14O27 · 21H2O |
| 4.FL.40 | Ranciéite | (Ca,Mn2+)0.2(Mn4+,Mn3+)O2 · 0.6H2O |
| 4.FL.40 | Takanelite | (Mn,Ca)Mn4O9 · H2O |
| 4.FL.55 | Cianciulliite | Mn(Mg,Mn)2Zn2(OH)10 · 2-4H2O |
| 4.FL.60 | Jensenite | Cu3[TeO6] · 2H2O |
| 4.FL.65 | Leisingite | Cu2MgTe6+O6 · 6H2O |
| 4.FL.70 | Akdalaite | Al10O14(OH)2 |
| 4.FL.75 | Cafetite | CaTi2O5 · H2O |
| 4.FL.80 | Mourite | UMo5O12(OH)10 |
| 4.FL.85 | Deloryite | Cu4(UO2)(MoO4)2(OH)6 |
| 4.FL.90 | Lagalyite | Ca2xMn1-xO2 · 1.5-2H2O |
| 4.FL.95 | Tunnerite (of Cornu) | |
| 4.FL.100 | Carbocalumite | Ca4Al2(OH)12(CO3) · 6H2O |
| 4.FL.100 | Mampsisite | Ca4Al2(CO3)(OH)12 · 5H2O |
Fluorescence of Birnessite
Not fluorescent in UV
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Birnessite
mindat.org URL:
https://www.mindat.org/min-680.html
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References for Birnessite
Reference List:
Frondel, C., Marvin, U. B., Ito, J. (1960) New data on birnessite and hollandite. American Mineralogist, 45 (7-8) 871-874
Potter, Russell M., Rossman, George R (1979) The tetravalent manganese oxides: identification, hydration, and structural relationships by infrared spectroscopy. American Mineralogist, 64 (11-12) 1199-1218
Dunn, Pete J., Fleischer, Michael, Francis, Carl A., Langley, Richard H., Kissin, Stephen A., Shigley, Hames E., Vanko, David A., Zilczer, Janet A. (1984) New mineral names. American Mineralogist, 69 (7-8) 810-815
Localities for Birnessite
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
Arctic Ocean | |
| Murdmaa et al. (2000) | |
| Bogdanov et al. (1995) +1 other reference | |
| Kravchishina et al. (2023) |
| Kravchishina et al. (2023) | |
| Kravchishina et al. (2023) | |
Atlantic Ocean | |
| Varentsov et al. (2009, April) | |
| Hein et al. (2016) | |
| Milinovic +6 other references |
| Canadian Mineralogist Vol.26 (1988) | |
| Yang et al. (2022) |
Australia | |
| Vera Munro-Smith (2006) |
| Brown et al. (1992) |
| Brown et al. (1992) |
| Worner et al. (et al) |
| Ostwald (1981) +1 other reference |
| |
| |
| Jones et al. (2013) |
| Bridge et al. (1978) |
| Putzolu et al. (2018) |
Austria | |
| G. Blass (2001) |
| Strasser (1989) |
| R.Poeverlein (2016) |
| Taucher et al. (1992) |
Brazil | |
| Rocks & Minerals (2009) |
| Waber (1991) |
Canada | |
| Peatfield (n.d.) |
| MONCUR et al. (2015) |
| Sabina (2015) +1 other reference |
| 166-175. +2 other references |
| Horváth et al. (1998) |
| Horváth et al. (1998) | |
Chile | |
| Pincheira et al. (1990) |
| Cook (1978) |
China | |
| Fengjun Ma (1986) |
| Ruixia Hao and Guangyue Guan (1995) |
| Ruixia Hao and Guangyue Guan (1995) |
| Guilin Institute of Metallurgical Geology et al. (1976) |
| Guilin Institute of Metallurgical Geology et al. (1976) |
| Guilin Institute of Metallurgical Geology et al. (1976) | |
| Guilin Institute of Metallurgical Geology et al. (1976) |
| Jingqu Yao (1992) |
| Jingqu Yao (1992) | |
| Jingqu Yao (1992) |
| Yuchun Yang (1990) |
Czech Republic | |
| Matýsek D (2021) |
| Jirásek J et al. (2019) |
| Kuttna +1 other reference |
| Jirásek J. et al. (2018) |
| Jirásek J. et al. (2018) |
Egypt | |
| Salama et al. (2012) |
| Afify et al. (2022) |
Finland | |
| Schwertmann |
France | |
| Wittern et al. (Cologne) |
| Perseil (1975) | |
| Perseil (1975) | |
| Pelleter et al. (2017) |
| Wittern et al. (Cologne) |
| Staszak et al. (2022) |
| P. Picot |
| Bull. Soc. Franç. Minéralo. ... |
| Bull. Soc. Franç. Minéralo. ... |
| P. Picot | |
| Bull. Soc. Franç. Minéralo. ... |
| Bull. Soc. Franç. Minéralo. ... | |
| Le Règne Minéral 47: 5-21 |
| Bull. Soc. Franç. Minéralo. ... |
| De Ascenção Guedes et al. (2002) |
| BERBAIN. C et al. (2016) |
| Berbain et al. (2005) |
Germany | |
| Walenta (1992) |
| Weiß (1990) |
| Held et al. (1993) |
| Wittern (2001) |
| Lapis 30 (7/8) |
Greece | |
| Pantó et al. (2001) |
| Φωτιάδης (2010) |
| Φωτιάδης (2010) |
| Hein +2 other references |
| Altherr et al. (2013) |
Greenland | |
| Petersen (2001) |
Hungary | |
| Sándor et al. (1997) |
| Szakáll: Minerals of Szár Hill |
| Szakáll-Gatter-Szendrei: Mineral ... |
India | |
| Acharya et al. (1997) |
| Rao +1 other reference |
Indonesia | |
| Milési et al. (1999) |
Israel | |
| Hans Niedermeier (2000) | |
Italy | |
| • Barresi et al. (2005) |
| Piccoli et al. (2007) |
| Sinisi et al. (2018) |
| doi.org (n.d.) +2 other references |
| Pipino (1984) |
| P. Mattias- M. Guerra (2008) |
| Boni et al. (1976) |
| Maletto et al. (2014) |
| Eckhardt et al. (1997) |
| Rossi et al. (1980) | |
| Eckhardt et al. (1997) | |
Japan | |
| Am Min 48:952-954 |
| Dr. Matsuo Nambu collection (curated at Geological Survey of Japan) |
| Dr. Matsuo Nambu collection (curated at Geological Survey of Japan) |
| Dr. Matsuo Nambu collection (curated at Geological Survey of Japan) |
| Dr. Matsuo Nambu collection (curated at Geological Survey of Japan) |
| Nambu M (1967) |
| Dr. Matsuo Nambu collection (curated at Geological Survey of Japan) |
| Dr. Matsuo Nambu collection (curated at Geological Survey of Japan) | |
| Dr. Matsuo Nambu collection (curated at Geological Survey of Japan) | |
| Nambu et al. (1961) | |
| Dr. Matsuo Nambu collection (curated at Geological Survey of Japan) | |
| Dr. Matsuo Nambu collection (curated at Geological Survey of Japan) |
| Dr. Matsuo Nambu ore collection (curated at Geological Survey of Japan) |
| Dr. Matsuo Nambu collection (curated at Geological Survey of Japan) | |
| Dr. Matsuo Nambu collection (curated at Geological Survey of Japan) | |
| Dr. Matsuo Nambu collection (curated at Geological Survey of Japan) | |
| Dr. Matsuo Nambu collection (curated at Geological Survey of Japan) | |
| Dr. Matsuo Nambu collection (curated at Geological Survey of Japan) |
| Dr. Matsuo Nambu collection (curated at Geological Survey of Japan) |
| Dr. Matsuo Nambu collection (curated at Geological Survey of Japan) | |
| Dr. Matsuo Nambu collection (curated at Geological Survey of Japan) |
| Anthony (1997) +1 other reference |
| Dr. Matsuo Nambu collection (curated at Geological Survey of Japan) |
| Y. Okayama: Hydrothermal manganese oxides from southwest region of Aogashima island. Mining Geology (3) |
| Jose Carlos Mañuz Sanz collection |
| Dr. Matsuo Nambu collection (curated at Geological Survey of Japan) |
Jordan | |
| Qatar Univ. Sci. J. 21:101-117. |
Kazakhstan | |
| Golubovskaya (2003) |
Mexico | |
| Cross (2006) |
| Ref.: Revista Mexicana de Ciencias Geológicas et al. (2000) |
| Lapis 2001 (1) |
Moldova | |
| Klimchouk (2012) |
Nazca Plate | |
| Zawadzki et al. (2022) | |
New Zealand | |
| Railton et al. (1990) | |
| de Ronde +16 other references |
North Macedonia | |
| Djordjevic et al. (2021) |
Norway | |
| Neumann (1959) |
| K.Eldjarn XRD MGM +1 other reference |
| Knut Eldjarn specimen. XRD MGM | |
| Raade (2005) |
Pacific Ocean | |
| Glasby et al. (2006) |
| Mee Burns et al. (1978) |
| Skowronek et al. (2021) | |
| Mikhailik et al. (2021) +1 other reference | |
| Novikov et al. (2006) |
| Mikhailik +4 other references |
| Xu et al. (2024) | |
| Volokhina et al. (2020) +4 other references |
| Hein et al. (2010) |
| Hein et al. (2010) | |
| Hein et al. (2010) | |
| Lisitsyn et al. (1999) |
| Mikhailik et al. (2021) | |
| Mikhailik et al. (2021) | |
Papua New Guinea | |
| Zhigang Zeng et al. (12) |
Poland | |
| DOI: 10.1515/mipo-2016-0002 +2 other references |
| Ł. Kruszewski PXRD & pXRF data (paper in preparation) |
| Ł. Kruszewski PXRD & pXRF data (paper in preparation) |
| Ł. Kruszewski PXRD & pXRF data (paper in preparation) |
Romania | |
| Onac et al. (1997) |
| al României (2003) |
| D. Dumitras (2000) +1 other reference |
| Munteanu (1993) +1 other reference |
| minerals-of-the-carpathians.eu (2008) |
Russia | |
| Glasby et al. (2006) |
| www.igem.ru (2001) |
| ... |
| Glasby et al. (2006) |
| Glasby et al. (2006) | |
| Kasatkin et al. (2021) |
Slovakia | |
| Cílek V. +1 other reference |
South Africa | |
| Gutzmer (1996) |
| South African Micromount Society et al. (1989) |
| Cairncross et al. (1995) | |
South Korea | |
| Choi et al. (2005) |
Spain | |
| Mata-Perelló (1979) |
| Merino et al. (2019) |
| Marino et al. (2019) |
| Rossi et al. (2010) |
| Abad +3 other references |
| A. Crespo & R. Lunar (1997) |
| Calvo (2009) |
| Mata Perelló |
Sweden | |
| Sjöberg S. Microbially mediated ... +2 other references |
| Pers.report to the Långban Society +1 other reference |
Switzerland | |
| Stalder et al. (1998) |
| Stalder et al. (1998) | |
| The Canadian Mineralogist Vol. 44 (2006) +1 other reference |
Tonga | |
| Paropkari et al. (2010) |
| Stackelberg et al. (1990) |
UK | |
| Golley et al. (1995) |
| Elton et al. (2004) |
| Betterton (1989) +1 other reference |
| Tindle (2008) | |
| Jones et al. (1956) +1 other reference |
| Nicholson (1989) |
| Notes about Gourock |
| Livingstone (2002) |
| |
Ukraine | |
| Chukhrov F.V. et al. (1987) |
USA | |
| Rocks & Minerals: 70 (5) |
| Anthony et al. (1995) |
| Anthony et al. (1995) | |
| Bargar et al. (2009) |
| AmMin 56:1057 |
| Van Nostrand Reinholt Press: 168 (photo 4-5) +2 other references | |
| Huebner +3 other references |
| Anthony (1997) |
| Eckel et al. (1997) | |
| Eckel et al. (1997) |
| Eckel et al. (1997) |
| Schooner (circa 1980s) |
| King et al. (1994) |
| King (n.d.) | |
| King (n.d.) | |
| www.irocks.com (2020) |
| Anthony (1997) |
| "Western Massachusetts Mineral ... +1 other reference |
| H.A. Barrett and M.P.S. Krekeler (2011) |
| Castor et al. (2004) |
| Castor et al. (2004) | |
| Rocks & Minerals (Sept/Oct 1981) |
| Frondel et al. (1960) +1 other reference |
| Frondel et al. (1960) +1 other reference | |
| Rocks & Min.: 60:229. |
| Jerry Cone Collection |
| Patrick Haynes |
| Geological Society of America Bulletin ... |
| Horton et al. (1981) +1 other reference |
| Michael W. Kieron collection |
| Museum of Natural History & Planetarium | |
| Haynes (2000) |
| Mineral News: 13 (9) |
| Collected by and in the collection of ... | |
| U.S. GEOLOGICAL SURVEY PROFESSIONAL ... +1 other reference |
| Bullock (1981) |
| Dietrich (1990) |
| Dietrich (1990) |
| Bowser |
Vanuatu | |
| Iizasa et al. (1998) | |
| Iizasa et al. (1998) |
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Clarion-Clipperton zone, Pacific Ocean