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
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 for Standard |
|---|---|---|
| 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
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
Surface Relief:
Very High (positive)
Relative to Canada balsam mounting medium (n ≈ 1.537).
Relative to Canada balsam mounting medium (n ≈ 1.537).
This shows the grain boundary and Becke line effect under plane-polarised
light, based on the contrast between this mineral's average refractive
index and the mounting medium. It does not take into account mineral
colouration.
In focus
Interference Figure:
This shows the idealized biaxial acute bisectrix (Bxa) interference figure
- the conoscopic view for a grain cut perpendicular to the acute bisectrix, using
this mineral's 2V. The two small white dots mark the melatopes - the points
where the two optic axes emerge - and are shown only when they fall within the
field of view. The coloured bands are isochromatics, and the dark bands are
isogyres.
Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
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
Element Weights:
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
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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
Relationship of Cobaltkoritnigite to other Species
Member of:
Other Members of Koritnigite Group:
| Koritnigite | Zn(AsO3OH) · H2O | Tric. 1 : P1 |
| Magnesiokoritnigite | Mg(AsO3OH) · H2O | Tric. 1 : P1 |
Common Associates
Associations Based on Photo Data:
| 14 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 Quartz | SiO2 |
| 2 photos of Cobaltkoritnigite associated with Spherocobaltite | CoCO3 |
| 2 photos of Cobaltkoritnigite associated with Moorhouseite | Co2+(H2O)6(SO4) |
| 2 photos of Cobaltkoritnigite associated with Arsenolite | As2O3 |
| 1 photo of Cobaltkoritnigite associated with Metaheinrichite | Ba(UO2)2(AsO4)2 · 8H2O |
| 1 photo of Cobaltkoritnigite associated with Hörnesite | Mg3(AsO4)2 · 8H2O |
| 1 photo of Cobaltkoritnigite associated with Picropharmacolite | Ca4Mg(AsO4)2(HAsO4)2 · 11H2O |
Related Minerals - Strunz-mindat Grouping
| 8.CB. | Krupičkaite | Cu6[AsO3(OH)]6 · 8H2O |
| 8.CB.X | Honzaite | Ni2(AsO3OH)2 · 5H2O |
| 8.CB.X | Redondite | AlPO4 · 2H2O |
| 8.CB.05 | Ermeloite | Al(PO4) · H2O |
| 8.CB.05 | Serrabrancaite | MnPO4 · H2O |
| 8.CB.10 | Nyholmite | Cd3Zn2(AsO3OH)2(AsO4)2 · 4H2O |
| 8.CB.10 | Villyaellenite | (Mn,Ca)Mn2Ca2(AsO3OH)2(AsO4)2 · 4H2O |
| 8.CB.10 | Giftgrubeite | CaMn2Ca2(AsO4)2(AsO3OH)2 · 4H2O |
| 8.CB.10 | Hureaulite | Mn2+5(PO3OH)2(PO4)2 · 4H2O |
| 8.CB.10 | Miguelromeroite | Mn2+5(AsO3OH)2(AsO4)2(H2O)4 |
| 8.CB.10 | 'UM1997-09-AsO:CaHMgZn' | (Mg,Ca,Zn)5(AsO4)2(HAsO4)2 · 4H2O |
| 8.CB.15 | Krautite | Mn(HAsO4) · H2O |
| 8.CB.20 | Magnesiokoritnigite | Mg(AsO3OH) · H2O |
| 8.CB.20 | Koritnigite | Zn(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.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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Mineral Dealers:
References for Cobaltkoritnigite
Reference List:
Frost, Ray L., López, Andrés, Xi, Yunfei, Lana, Cristiano, Souza, Larissa, Scholz, Ricardo, Sejkora, Jiří, Čejka, Jiří (2014) A vibrational spectroscopic study of the arsenate minerals cobaltkoritnigite and koritnigite. Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 125. 313-318 doi:10.1016/j.saa.2014.01.106
Localities for Cobaltkoritnigite
Showing 40 localities.
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.
Canada | |
| Carnegie Museum of Natural History ... |
Czech Republic | |
| Hloušek et al. (2002) |
| Stephan Wolfsried collection |
| M.E. Ciriotti |
Germany | |
| Kolitsch et al. (2005) |
| 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 - ... +1 other reference |
| Gerhard Möhn Collection |
| www.mineralienatlas.de (2016) |
| Massanek et al. (2005) |
| Witzke (1996) +1 other reference | |
| Massanek et al. (2005) | |
| 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 | |
| CARMONA RUIZ et al. (2025) |
| Garrido et al. (2013) |
Switzerland | |
| Ansermet (2012) |
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Amphibolite quarry, Mackenheim, Abtsteinach, Bergstraße, Darmstadt, Hesse, Germany