Cobaltkoritnigite
A valid IMA mineral species
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About Cobaltkoritnigite
Formula:
Co(AsO3OH) · H2O
Colour:
Pale purple to intense purple, pale rose red to intense purple-rose
Lustre:
Sub-Vitreous, Greasy, Silky, Dull
Hardness:
2 - 3
Specific Gravity:
3.44 (Calculated)
Crystal System:
Triclinic
Member of:
Name:
Named by K. Schmetzer, W. Horn, and O. Medenbach in 1981 for the cobalt analog of koritnigite.
Isostructural with:
Small (1 mm or less) acicular crystals in dense radial sprays.
May be confused with erythrite.
Compare also burgessite.
May be confused with erythrite.
Compare also burgessite.
Unique Identifiers
Mindat ID:
1091
Long-form identifier:
mindat:1:1:1091:3
GUID
(UUID V4):
(UUID V4):
cf0d6984-0091-40a7-a775-a63ea36157e8
IMA Classification of Cobaltkoritnigite
Classification of Cobaltkoritnigite
8.CB.20
8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
B : With only medium-sized cations, RO4:H2O = 1:1
8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
B : With only medium-sized cations, RO4:H2O = 1:1
39.1.4.2
39 : HYDRATED ACID PHOSPHATES,ARSENATES AND VANADATES
1 : A[HXO4]·xH2O
39 : HYDRATED ACID PHOSPHATES,ARSENATES AND VANADATES
1 : A[HXO4]·xH2O
20.10.6
20 : Arsenates (also arsenates with phosphate, but without other anions)
10 : Arsenates of Co and Ni
20 : Arsenates (also arsenates with phosphate, but without other anions)
10 : Arsenates of Co and Ni
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 |
---|---|---|
Ckor | 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 Cobaltkoritnigite
Sub-Vitreous, Greasy, Silky, Dull
Transparency:
Transparent, Translucent
Colour:
Pale purple to intense purple, pale rose red to intense purple-rose
Streak:
Pale pink
Hardness:
2 - 3 on Mohs scale
Hardness Data:
Estimated
Tenacity:
Brittle
Cleavage:
Perfect
{010} perfect; {100} good.
{010} perfect; {100} good.
Density:
3.44 g/cm3 (Calculated)
Comment:
NJMM 257 (1981)
Optical Data of Cobaltkoritnigite
Type:
Biaxial (+)
RI values:
nα = 1.646 nβ = 1.668 nγ = 1.705
2V:
Measured: 78° , Calculated: 78°
Birefringence:
0.059
Max Birefringence:
δ = 0.059
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:
Moderate
Dispersion:
weak
Optical Extinction:
X ∧ b = 3°, Y ∧ a = 12.5°.
Pleochroism:
Strong
Comments:
X = deep violet; Y = reddish violet; Z = bluish violet.
Chemistry of Cobaltkoritnigite
Mindat Formula:
Co(AsO3OH) · H2O
Elements listed:
Crystallography of Cobaltkoritnigite
Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Setting:
P1
Cell Parameters:
a = 7.95 Å, b = 15.83 Å, c = 6.67 Å
α = 90.9°, β = 96.6°, γ = 90.0°
α = 90.9°, β = 96.6°, γ = 90.0°
Ratio:
a:b:c = 0.502 : 1 : 0.421
Unit Cell V:
833.74 ų (Calculated from Unit Cell)
Z:
8
Comment:
NJMM 257 (1981)
Crystal Structure
Load
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
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CIF File Best | x | y | z | a | b | c
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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) |
---|---|---|---|---|---|---|---|
0015784 | Cobaltkoritnigite | Zettler F, Riffel H, Hess H, Keller P (1979) Cobalthydrogenarsenat-monohydrat. Darstellung und kristallstruktur Zeitschrift fur Anorganische und Allgemeine Chemie 454 134-144 | 1979 | synthetic | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
7.94 Å | (100) |
7.07 Å | (20) |
3.82 Å | (50) |
3.25 Å | (40) |
3.23 Å | (40) |
3.14 Å | (70) |
2.69 Å | (30) |
2.46 Å | (40) |
Comments:
ICDD 35-499
Geological Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
Stage 7: Great Oxidation Event | <2.4 |
47a : [Near-surface hydration of prior minerals] | |
47d : [Arsenates, antimonates, selenates, bismuthinates] | |
Stage 10b: Anthropogenic minerals | <10 Ka |
55 : Anthropogenic mine minerals |
Type Occurrence of Cobaltkoritnigite
General Appearance of Type Material:
Intensely colored purple tabular crystals.
Place of Conservation of Type Material:
National Museum of Natural History, Washington, D.C., USA, 148979.
Geological Setting of Type Material:
Oxidized cobalt ore, post-mining.
Associated Minerals at Type Locality:
Synonyms of Cobaltkoritnigite
Other Language Names for Cobaltkoritnigite
Spanish:Cobaltkoritnigita
Relationship of Cobaltkoritnigite to other Species
Member of:
Other Members of this group:
Koritnigite | Zn(AsO3OH) · H2O | Tric. 1 : P1 |
Magnesiokoritnigite | Mg(AsO3OH) · H2O | Tric. 1 : P1 |
Common Associates
Associated Minerals Based on Photo Data:
13 photos of Cobaltkoritnigite associated with Erythrite | Co3(AsO4)2 · 8H2O |
4 photos of Cobaltkoritnigite associated with Dolomite | CaMg(CO3)2 |
3 photos of Cobaltkoritnigite associated with Koritnigite | Zn(AsO3OH) · H2O |
2 photos of Cobaltkoritnigite associated with Moorhouseite | Co(SO4) · 6H2O |
2 photos of Cobaltkoritnigite associated with Spherocobaltite | CoCO3 |
1 photo of Cobaltkoritnigite associated with Skutterudite | CoAs3 |
1 photo of Cobaltkoritnigite associated with Baryte | BaSO4 |
1 photo of Cobaltkoritnigite associated with Metaheinrichite | Ba(UO2)2(AsO4)2 · 8H2O |
1 photo of Cobaltkoritnigite associated with Quartz | SiO2 |
1 photo of Cobaltkoritnigite associated with Hörnesite | Mg3(AsO4)2 · 8H2O |
Related Minerals - Strunz-mindat Grouping
8.CB. | Krupičkaite | Cu6[AsO3(OH)]6 · 8H2O |
8.CB. | Ermeloite | Al(PO4) · H2O |
8.CB.05 | Serrabrancaite | MnPO4 · H2O |
8.CB.10 | Hureaulite | Mn2+5(PO3OH)2(PO4)2 · 4H2O |
8.CB.10 | Villyaellenite | MnMn2Ca2(AsO4)2(HAsO4)2 · 4H2O |
8.CB.10 | UM1997-09-AsO:CaHMgZn | (Mg,Ca,Zn)5(AsO4)2(HAsO4)2 · 4H2O |
8.CB.10 | Nyholmite | Cd3Zn2(AsO4)2(HAsO4)2 · 4H2O |
8.CB.10 | Miguelromeroite | MnMn2Mn2(AsO4)2(HAsO4)2 · 4H2O |
8.CB.10 | Giftgrubeite | CaMn2Ca2(AsO4)2(AsO3OH)2 · 4H2O |
8.CB.15 | Krautite | Mn(HAsO4) · H2O |
8.CB.20 | Koritnigite | Zn(AsO3OH) · H2O |
8.CB.20 | Magnesiokoritnigite | Mg(AsO3OH) · H2O |
8.CB.25 | Yvonite | Cu(HAsO4) · 2H2O |
8.CB.30 | Geminite | Cu2+(AsO3OH) · H2O |
8.CB.35 | Schubnelite | Fe3+VO4 · H2O |
8.CB.40 | Radovanite | Cu2Fe3+(AsO4)(HAs3+O3)2 · H2O |
8.CB.45 | Kazakhstanite | Fe3+5V4+3V5+12O39(OH)9 · 9H2O |
8.CB.50 | Kolovratite | NixZny(VO4)0.67(x+y) · nH2O |
8.CB.60 | Burgessite | Co2(H2O)4[AsO3(OH)]2(H2O) |
8.CB.60 | Honzaite | Ni2(AsO3OH)2 · 5H2O |
8.CB.65 | Cardite | Zn5.5(AsO4)2(AsO3OH)(OH)3 · 3H2O |
Fluorescence of Cobaltkoritnigite
Not fluorescent
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 Cobaltkoritnigite
mindat.org URL:
https://www.mindat.org/min-1091.html
Please feel free to link to this page.
Please feel free to link to this page.
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References for Cobaltkoritnigite
Localities for Cobaltkoritnigite
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.
Czech Republic | |
| Lapis 2002 (7/8) |
| M.E. Ciriotti |
Germany | |
| Kolitsch et al. (2005) +1 other reference |
| collection Joachim Esche |
Walenta (1987) +1 other reference | |
| |
| |
Collection Elmar Lackner and many others | |
| Walenta (1992) |
| |
| Weiß (1990) |
Schmetzer et al. (1981) +1 other reference | |
| Weiß (1990) |
| Gröbner et al. (2011) |
| ohannes Markus Henrich +2 other references |
| Weiß (1990) |
| SEM-EDS |
| Wittern (2001) |
| Mineralogical Society of America - ... |
| www.mineralienatlas.de (2016) |
| Lapis 30 (7/8) |
Lapis 30 (7/8) | |
Lapis 30 (7/8) | |
Schmetzer et al. (1981) | |
Greece | |
| Rieck et al. (2018) |
Japan | |
| Okada et al (1994) |
Morocco | |
| Favreau et al. (2007) |
| Favreau et al. (2006) |
| JP Barral collection |
Favreau et al. (2006) | |
Favreau et al. (2006) +1 other reference | |
| Favreau et al. (2007) |
| Favreau et al. (2006) |
Spain | |
| Garrido et al. (2013) |
Switzerland | |
| Ansermet (2012) |
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Amphibolite quarry, Mackenheim, Abtsteinach, Bergstraße, Darmstadt, Hesse, Germany