Jacobsite
A valid IMA mineral species - grandfathered
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About Jacobsite
Formula:
Mn2+Fe3+2O4
Colour:
Black, gray in reflected light
Lustre:
Resinous, Sub-Metallic
Hardness:
5½ - 6½
Specific Gravity:
4.76
Crystal System:
Isometric
Member of:
Name:
Named in 1869 by Augustin Alexis Damour for the type locality of Jakobsberg, Sweden.
Type Locality:
Dimorph of:
Isostructural with:
Jacobsite-Magnetite Series.
Ferromagnetic. Often occurs in octahedral crystals.
Jacobsite-Q is a polymorph of jacobsite.
May be exomorphically exsolved from bixbyite.
Ferromagnetic. Often occurs in octahedral crystals.
Jacobsite-Q is a polymorph of jacobsite.
May be exomorphically exsolved from bixbyite.
Visit gemdat.org for gemological information about Jacobsite.
Unique Identifiers
Mindat ID:
2061
Long-form identifier:
mindat:1:1:2061:5
GUID
(UUID V4):
(UUID V4):
892983cc-9dec-4591-87b8-15cc4e9ac022
IMA Classification of Jacobsite
Approved, 'Grandfathered' (first described prior to 1959)
First published:
1869
Classification of Jacobsite
4.BB.05
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
B : Metal: Oxygen = 3:4 and similar
B : With only medium-sized cations
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
B : Metal: Oxygen = 3:4 and similar
B : With only medium-sized cations
7.2.2.2
7 : MULTIPLE OXIDES
2 : AB2X4
7 : MULTIPLE OXIDES
2 : AB2X4
7.19.3
7 : Oxides and Hydroxides
19 : Oxides of Mn and Fe
7 : Oxides and Hydroxides
19 : Oxides of Mn and Fe
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Symbol | Source | Reference |
---|---|---|
Jcb | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Jacobsite
Resinous, Sub-Metallic
Transparency:
Opaque
Colour:
Black, gray in reflected light
Streak:
Reddish black
Hardness:
5½ - 6½ on Mohs scale
Tenacity:
Brittle
Fracture:
Irregular/Uneven, Sub-Conchoidal
Density:
4.76 g/cm3 (Measured) 5.03 g/cm3 (Calculated)
Optical Data of Jacobsite
Type:
Isotropic
Colour in reflected light:
Gray-white with olive tint
Internal Reflections:
Brown
Pleochroism:
Non-pleochroic
Chemistry of Jacobsite
Mindat Formula:
Mn2+Fe3+2O4
Elements listed:
Common Impurities:
Zn
Crystallography of Jacobsite
Crystal System:
Isometric
Class (H-M):
m3m (4/m 3 2/m) - Hexoctahedral
Space Group:
Fd3m
Cell Parameters:
a = 8.457 Å
Unit Cell V:
604.85 ų (Calculated from Unit Cell)
Z:
8
Morphology:
Octahedral. Rarely found as crystals. Massive, granular.
Crystallographic forms of Jacobsite
Crystal Atlas:
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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) |
---|---|---|---|---|---|---|---|
0017061 | Jacobsite | Passerini L (1930) Ricerche sugli Spinelli.- II. I Composti. Cu Al2 O4, Mg Al2 O4, Mg Fe2 O4, Zn Al2 O4, Zn Cr2 O4, Zn Fe2 O4, Mn Fe2 O4 _cod_database_code 1010131 Gazzetta Chimica Italiana 60 389-399 | 1930 | 0 | 293 | ||
0017296 | Jacobsite | Montoro V (1938) Miscibilita fra gli ossidi salini di ferro e di manganese _cod_database_code 1010370 Gazzetta Chimica Italiana 68 728-733 | 1938 | 0 | 293 |
CIF Raw Data - click here to close
Epitaxial Relationships of Jacobsite
Epitaxial Minerals:
Hausmannite | Mn2+Mn3+2O4 |
Epitaxy Comments:
Oriented intergrowths (Vredenbergite).
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
4.906 Å | (20) |
3.005 Å | (35) |
2.563 Å | (100) |
2.450 Å | (12) |
2.124 Å | (25) |
1.7342 Å | (20) |
1.6355 Å | (35) |
1.5031 Å | (40) |
1.4376 Å | (4) |
1.3441 Å | (4) |
1.2962 Å | (20) |
1.2810 Å | (15) |
1.2276 Å | (10) |
1.1898 Å | (12) |
1.1355 Å | (7) |
1.1063 Å | (30) |
1.0623 Å | (14) |
0.9815 Å | (20) |
Comments:
ICDD 10-319 (synthetic)
Geological Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
Near-surface Processes | |
21 : Chemically precipitated carbonate, phosphate, iron formations | |
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 |
40 : Regional metamorphism (greenschist, amphibolite, granulite facies) |
Type Occurrence of Jacobsite
Place of Conservation of Type Material:
Swedish Museum of Natural History, Stockholm, Sweden.
Reference:
Damour, A.A. (1869) Notice sur la jakobsite, nouvelle espèce minérale. Comptes Rendus Hebdomadaires des Séances de l’Académie des Sciences: 69: 168-172.
Other Language Names for Jacobsite
Relationship of Jacobsite to other Species
Member of:
Other Members of this group:
Chromite | Fe2+Cr3+2O4 | Iso. m3m (4/m 3 2/m) : Fd3m |
Cochromite | CoCr2O4 | Iso. m3m (4/m 3 2/m) : Fd3m |
Coulsonite | Fe2+V3+2O4 | Iso. m3m (4/m 3 2/m) : Fd3m |
Cuprospinel | Cu2+Fe3+2O4 | Iso. m3m (4/m 3 2/m) |
Dellagiustaite | V2+Al2O4 | Iso. m3m (4/m 3 2/m) : Fd3m |
Deltalumite | (Al0.67◻0.33)Al2O4 | Tet. 4 2m : P4m2 |
Franklinite | Zn2+Fe3+2O4 | Iso. m3m (4/m 3 2/m) : Fd3m |
Gahnite | ZnAl2O4 | Iso. m3m (4/m 3 2/m) : Fd3m |
Galaxite | Mn2+Al2O4 | Iso. m3m (4/m 3 2/m) : Fd3m |
Guite | Co2+Co3+2O4 | Iso. |
Hausmannite | Mn2+Mn3+2O4 | Tet. 4/mmm (4/m 2/m 2/m) : I41/amd |
Hercynite | Fe2+Al2O4 | Iso. m3m (4/m 3 2/m) : Fd3m |
Hetaerolite | ZnMn2O4 | Tet. 4/mmm (4/m 2/m 2/m) : I41/amd |
Jacobsite-Q | Mn2+(Fe3+,Mn3+)2O4 | Tet. 4/mmm (4/m 2/m 2/m) : I41/amd |
Maghemite | (Fe3+0.67◻0.33)Fe3+2O4 | Iso. 4 3 2 : P41 3 2 |
Magnesiochromite | MgCr2O4 | Iso. m3m (4/m 3 2/m) : Fd3m |
Magnesiocoulsonite | MgV2O4 | Iso. m3m (4/m 3 2/m) |
Magnesioferrite | MgFe3+2O4 | Iso. m3m (4/m 3 2/m) : Fd3m |
Magnetite | Fe2+Fe3+2O4 | Iso. m3m (4/m 3 2/m) : Fd3m |
Manganochromite | Mn2+Cr2O4 | Iso. m3m (4/m 3 2/m) : Fd3m |
Nichromite | (Ni,Co,Fe)(Cr,Fe,Al)2O4 | Iso. m3m (4/m 3 2/m) : Fd3m |
Spinel | MgAl2O4 | Iso. m3m (4/m 3 2/m) : Fd3m |
Thermaerogenite | CuAl2O4 | Iso. m3m (4/m 3 2/m) : Fd3m |
Titanomaghemite | (Ti4+0.5◻0.5)Fe3+2O4 | Iso. 4 3 2 : P43 3 2 |
Trevorite | Ni2+Fe3+2O4 | Iso. m3m (4/m 3 2/m) : Fd3m |
UM1994-06-O:AlCo | CoAl2O4 | |
Vuorelainenite | Mn2+V3+2O4 | Iso. m3m (4/m 3 2/m) : Fd3m |
Zincochromite | ZnCr2O4 | Iso. m3m (4/m 3 2/m) : Fd3m |
Forms a series with:
Common Associates
Associated Minerals Based on Photo Data:
41 photos of Jacobsite associated with Calcite | CaCO3 |
11 photos of Jacobsite associated with Zincite | ZnO |
10 photos of Jacobsite associated with Manganosite | MnO |
10 photos of Jacobsite associated with Plumboferrite | Pb2(Fe3+,Mn2+,Mg)11O19 |
7 photos of Jacobsite associated with Tephroite | Mn2+2SiO4 |
7 photos of Jacobsite associated with Alleghanyite | Mn2+5(SiO4)2(OH)2 |
7 photos of Jacobsite associated with Lindqvistite | Pb2Mn2+Fe16O27 |
7 photos of Jacobsite associated with Andradite | Ca3Fe3+2(SiO4)3 |
6 photos of Jacobsite associated with Kutnohorite | CaMn2+(CO3)2 |
5 photos of Jacobsite associated with Galaxite | Mn2+Al2O4 |
Related Minerals - Strunz-mindat Grouping
4.BB. | Elgoresyite | (Mg5Si2)O9 |
4.BB. | Chenmingite | FeCr2O4 |
4.BB. | Dellagiustaite | V2+Al2O4 |
4.BB. | Thermaerogenite | CuAl2O4 |
4.BB. | Chukochenite | LiAl5O8 |
4.BB. | Garpenbergite | Mn6◻AsSbO10(OH)2 |
4.BB. | Magnéliite | Ti3+2Ti4+2O7 |
4.BB. | Jianmuite | ZrTi4+Ti3+5Al3O16 |
4.BB.05 | Chromite | Fe2+Cr3+2O4 |
4.BB.05 | Cochromite | CoCr2O4 |
4.BB.05 | Coulsonite | Fe2+V3+2O4 |
4.BB.05 | Cuprospinel | Cu2+Fe3+2O4 |
4.BB.05 | Filipstadite | (Fe3+0.5Sb5+0.5)Mn2O4 |
4.BB.05 | Franklinite | Zn2+Fe3+2O4 |
4.BB.05 | Gahnite | ZnAl2O4 |
4.BB.05 | Galaxite | Mn2+Al2O4 |
4.BB.05 | Hercynite | Fe2+Al2O4 |
4.BB.05 | Manganochromite | Mn2+Cr2O4 |
4.BB.05 | Magnesiocoulsonite | MgV2O4 |
4.BB.05 | Magnesiochromite | MgCr2O4 |
4.BB.05 | Magnesioferrite | MgFe3+2O4 |
4.BB.05 | Magnetite | Fe2+Fe3+2O4 |
4.BB.05 | Nichromite | (Ni,Co,Fe)(Cr,Fe,Al)2O4 |
4.BB.05 | Qandilite | (Mg,Fe3+)2(Ti,Fe3+,Al)O4 |
4.BB.05 | Spinel | MgAl2O4 |
4.BB.05 | Trevorite | Ni2+Fe3+2O4 |
4.BB.05 | Ulvöspinel | TiFe2+2O4 |
4.BB.05 | Vuorelainenite | Mn2+V3+2O4 |
4.BB.05 | Zincochromite | ZnCr2O4 |
4.BB.05 | Harmunite | CaFe2O4 |
4.BB.05 | Wernerkrauseite | Ca(Fe3+,Mn3+)2Mn4+O6 |
4.BB.05 | Deltalumite | (Al0.67◻0.33)Al2O4 |
4.BB.05 | Guite | Co2+Co3+2O4 |
4.BB.10 | Hausmannite | Mn2+Mn3+2O4 |
4.BB.10 | Hetaerolite | ZnMn2O4 |
4.BB.10 | Manganostibite | (Mn,Fe)7SbAsO12 |
4.BB.15 | Maghemite | (Fe3+0.67◻0.33)Fe3+2O4 |
4.BB.15 | Titanomaghemite | (Ti4+0.5◻0.5)Fe3+2O4 |
4.BB.20 | Tegengrenite | (Mn3+0.5Sb5+0.5)Mg2O4 |
4.BB.25 | Xieite | Fe2+Cr2O4 |
4.BB.30 | Carmeltazite | ZrAl2Ti4O11 |
4.BB.35 | Feiite | Fe2+2(Fe2+Ti4+)O5 |
4.BB.40 | Maohokite | MgFe2O4 |
4.BB.45 | Tschaunerite | (Fe2+)(Fe2+Ti4+)O4 |
Fluorescence of Jacobsite
Not fluorescent in ultraviolet
Other Information
Magnetism:
Ferromagnetic
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 Jacobsite
mindat.org URL:
https://www.mindat.org/min-2061.html
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References for Jacobsite
Reference List:
Orcel, Jean, Pavlovitch, Stoyan (1931) Les caractères microscopiques des oxydes de manganèse et des manganites naturels (Détermination de leurs pouvoirs réflecteurs) Bulletin de Minéralogie, 54 (5) 108-179 doi:10.3406/bulmi.1931.4130
(1980) International Mineralogical Association: Commission on New Minerals and Mineral Names. Mineralogical Magazine, 43 (332) 1053-1055 doi:10.1180/minmag.1980.043.332.17
Beard, James S., Tracy, Robert J. (2002) Spinels and other oxides in Mn-rich rocks from the Hutter Mine, Pittsylvania County, Virginia, U.S.A.: Implications for miscibility and solvus relations among jacobsite, galaxite, and magnetite. American Mineralogist, 87 (5) 690-698 doi:10.2138/am-2002-5-611
Wen, Shanshan, Chen, Bing, Zhang, Junhong, Zhan, Wenlong, He, Zhijun, Gao, Lihua (2023) Systematic Study on the Synthesis and Magnetism Properties of Manganese Ferrite MnFe2O4 by an Oxidation Roasting Process. Crystals, 13 (10) doi:10.3390/cryst13101509
Localities for Jacobsite
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).
Struck out - Mineral was erroneously reported from this locality.
Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
All localities listed without proper references should be considered as questionable.
Australia | |
| Stillwell et al. (1950) |
| Ramdohr (1950) |
| Collection of M.Willoughby. ... |
| Pilkington et al. (1979) |
Austria | |
| Meixner (1935) |
Strasser (1989) | |
| Strasser (1989) |
| www.franzbernhard.x10hosting.com (2016) |
| Kolitsch et al. (2019) |
| Kolitsch et al. (2019) |
| Kolitsch et al. (2021) |
| Neinaveie (1979) |
| Kolitsch et al. (2017) |
Brazil | |
| Varentsov (1996) |
Canada | |
| BC Minfile +1 other reference |
| Geoffrey Khalil Abdallah (1990) |
Chile | |
| Singer et al. (2005) |
China | |
| Dairong Yan et al. (2006) |
| Liangkai Gu (1986) |
| Jingqu Yao (1992) |
Jingqu Yao (1992) | |
| Jingqu Yao (1992) |
| Zhao et al. (2024) |
| Baisheng Zhang (1998) |
| Fan Delian et al. (1992) |
| Yuchun Yang (1990) |
Czech Republic | |
| |
Egypt | |
| Alekseev et al. (2023) |
Alekseev et al. (2023) | |
| Afify et al. (2022) |
France | |
| Chopin (1978) |
| Chopin (1978) |
| Chauris (2014) |
| Weil et al. (1958) |
| Inventaire minéralogique de la France ... |
Germany | |
| Hentschel (1987) |
Mineralien Welt 1/93:14 +1 other reference | |
| Hentschel (1987) |
| Hentschel (1987) |
| [Blass et al. (Stuttgart) |
| Christof Schäfer collection |
Ghana | |
| Mücke et al. (1999) |
Greece | |
| Kilias +6 other references |
| Tombros et al. (2023) |
India | |
| Econ Geol (1980) |
Econ Geol (1980) | |
Econ Geol (1980) | |
| Rao et al. (1979) |
| Dasgupta et al. (1987) |
| Roy et al. (1968) |
| Tait et al. (2005) |
| MINERALOGICAL MAGAZINE +1 other reference |
Mineralogical Magazine 1968 36 : ... | |
| Yadav (2022) |
| Acharya et al. (1997) |
| Nicholson et al. (1997) |
Iran | |
| Lotfi et al. (2017) |
Israel | |
AmMin 45:734 | |
| Galuskin et al. (2016) |
Italy | |
| Eur. J. Mineral 18:569–582 (2006) |
| AA. VV. |
Oberti et al. (2018) | |
| Fadda (1989) |
| Rendiconti della Società Mineralogica Italiana et al. (abstract) +1 other reference |
Japan | |
| Fukuoka (1981) |
| 加藤昭 (1980) +1 other reference |
| Dr. Yohachiro Okamoto collection (curated at Geological Survey museum, Japan) |
| Matsubara et al. (1996) |
| Minerals in Japan (Field Best Encyclopedia V. 15, 2003) |
Matsubara Satoshi et al. (1980) | |
FUKUOKA et al. (1977) | |
| Dr. Kameki Kinoshita collection (curated at Geological Survey of Japan) +1 other reference |
University of Tokyo collection | |
| 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 ore collection (curated at Geological Survey of Japan) | |
Fukuoka (1981) | |
Dr. Matsuo Nambu collection (curated at Geological Survey of Japan) | |
| Dr. Matsuo Nambu collection (curated at Geological Survey of Japan) |
| Watanabe (1959) |
| Tanida et al. (1982) |
| 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 by the 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 ore collection (curated at Geological Survey of Japan) |
| Dr. Matsuo Nambu collection (curated at Geological Survey of Japan) |
| 加藤昭 (1980) |
| Takabatake (1956) |
| M. Nakagawa et al. (2009) |
| Yamada (2004) |
| Masutomi Museum specimens (Kyoto) |
| Yamada (2004) |
Yamada (2004) | |
| |
| Yamada (2004) |
| Uehara et al. (2014) |
| Fukuoka (1981) |
Akira Kato (2011) | |
Akira Kato (2011) | |
| Okamoto collection (curated at the Geological Survey museum, Japan) +1 other reference |
| K. Nishikubo et al. (2005) |
| Yamada (2004) |
Kato (2010) | |
| Yamada (2004) |
| Masutomi Museum specimen (Kyoto) |
| Katsu Kaneko (1956) |
| Masutomi Museum specimen (Kyoto) |
Yamada (2004) | |
| 加藤昭 (1980) +1 other reference |
Hiroaki Tano specimens +1 other reference | |
| Akira Kato (undated manuscript) +1 other reference |
University of Tokyo collection | |
Petrov (n.d.) | |
University of Tokyo collection | |
| 加藤昭 (1980) +1 other reference |
| Banno et al. (2012) +1 other reference |
| Masutomi Museum specimen (Kyoto) |
| Am Min (1955) |
Kazakhstan | |
| Dyussembayeva et al. (2013) |
| Kayupova (1965) +1 other reference |
Kayupova (1964) | |
| Frank Dzubeck +2 other references |
| Kayupova (1963) |
Kenya | |
| A. N. Zaitsev et al. (2013) |
Mexico | |
| Megaw (2023) |
Middle East | |
Vapnik et al. (2014) | |
Mongolia | |
| Gottesmann (2009) +1 other reference |
Morocco | |
| Varentsov (1996) |
Namibia | |
| von Bezing (2007) +1 other reference |
| American Mineralogist +1 other reference |
Criddle et al. (1990) | |
North Macedonia | |
| Bulletin of the Chemists and Technologists of Macedonia et al. (2004) +1 other reference |
Norway | |
| Krogh (1977) |
| Westerweld (1961) |
Pacific Ocean | |
| Volokhin et al. (2020, April) |
Papua New Guinea | |
| Cabri et al. (2022) |
Poland | |
| Ł. Kruszewski PXRD & pXRF data (paper in preparation) |
Romania | |
| Udubasa et al. (1996) +2 other references |
| minerals-of-the-carpathians.eu (2008) |
| Hîrtopanu (1997) +1 other reference |
Russia | |
| Brusnitsyn et al. (2009) |
| Okrugin et al. (an Example of Mutnovsky Geothermal Area, Southern Kamchatka) +1 other reference |
| Timofeeva et al. (2014) |
Slovakia | |
| Szakáll et al. (2013) |
Martin Števko-unpublished | |
| Ozdín et al. (2010) |
South Africa | |
| Wilson et al. (1978) |
Econ Geol (1987) | |
Preston (2009) +1 other reference | |
| Cairncross et al. (1995) |
South African Micromount Society (2014) | |
Cairncross et al. (1995) | |
| P. G. Sonhnge (1950) |
Spain | |
| Onac et al. (2014) +1 other reference |
| Casillas et al. (2024) |
| Dill et al. (2023) |
Dill et al. (2023) | |
Sudan | |
| www.gras-sd.com (2004) |
Sweden | |
| Min Mag 66 (2) |
| Palache et al. (1951) +1 other reference |
| Roy (1972) |
Igelström (1890) | |
Holtstam (1997) | |
Koark (1970) | |
| Damman (1989) |
| Holtstam et al. (1999) |
Wiklund et al. (2003) | |
Nysten (2014) | |
Lorin (2003) | |
| Johansson (1928) +2 other references |
Gatedal (n.d.) +1 other reference | |
Holtstam et al. (1995) | |
Nysten (2003) | |
Holtstam et al. (1998) | |
Palache et al. (1951) | |
| Nysten (2003) |
| Ounchanum et al. (1987) |
Nysten (2020) | |
Nysten et al. (2016) | |
| K.Gatedal +7 other references |
Switzerland | |
| Stalder et al. (1998) |
Brugger (1996) +1 other reference | |
| Stalder et al. (1998) |
| Stalder et al. (1998) +1 other reference |
| Stalder et al. (1998) |
Tanzania | |
| Zaitsev (2010) |
Mitchell et al. (2021) | |
Turkey | |
| Öztürk (1997) |
| Oksuz (2018) |
| Oksuz (2018) |
UK | |
| Cotterel (2010) |
| Cotterell (2006) |
| Liferovich et al. (2006) |
| Cotterell (2013) |
Ukraine | |
| Sungatullin et al. (2018) |
USA | |
| Grant et al. (2005) |
| Econ Geol (1992) |
| - (2005) |
| Schooner (circa 1980s) |
| Rocks & Min.:64:189 +1 other reference |
| Plante (1992) |
| Shawn Carlson (2010) |
... | |
| Morris Jr. (1983) |
| Frondel et al. (1965) +2 other references |
| Rocks & Min.: 60:130-135. |
| Johannes Peter +4 other references |
| Beard et al. (2002) +1 other reference |
| Cannon (1975) |
Cannon (1975) | |
| Cannon (1975) |
Cannon (1975) +1 other reference | |
| Cannon (1975) |
Cannon (1975) |
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Pumice quarries, Wingertsberg, Mendig, Mendig, Mayen-Koblenz, Rhineland-Palatinate, Germany