Cronusite
A valid IMA mineral species
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About Cronusite
Formula:
Ca0.2CrS2 · 2 H2O
Colour:
Black
Lustre:
Sub-Metallic
Hardness:
1½
Specific Gravity:
2.51
Crystal System:
Trigonal
Name:
From the Greek name for Kronos (the son of Uranus and Gaea), one of the Titans in Greek mythology. Allusion to combined meteor–terrestrial origin, weathering of caswellsilverite.
Type Locality:
Found in an enstatite achondrite meteorite with other chromium-rich minerals.
Schöllhornite has probably formed by terrestrial weathering of caswellsilverite.
Schöllhornite has probably formed by terrestrial weathering of caswellsilverite.
Unique Identifiers
Mindat ID:
11188
Long-form identifier:
mindat:1:1:11188:9
GUID
(UUID V4):
(UUID V4):
5000fb41-374a-4cfe-84e1-1134eb7be588
IMA Classification of Cronusite
Approved
IMA Formula:
Ca0.2CrS2 · 2H2O
Approval year:
1999
First published:
2001
Classification of Cronusite
2.FB.05
2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
F : Sulfides of arsenic, alkalies; sulfides with halide, oxide, hydroxide, H2O
B : With alkalies (without Cl, etc.)
2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
F : Sulfides of arsenic, alkalies; sulfides with halide, oxide, hydroxide, H2O
B : With alkalies (without Cl, etc.)
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 |
---|---|---|
Cnu | 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 Cronusite
Sub-Metallic
Transparency:
Opaque
Colour:
Black
Streak:
Black
Hardness:
1½ on Mohs scale
Hardness:
VHN10=82 - 109 kg/mm2 - Vickers
Hardness Data:
Measured
Cleavage:
Perfect
(001)
(001)
Density:
2.51 g/cm3 (Measured) 2.55 g/cm3 (Calculated)
Optical Data of Cronusite
Anisotropism:
strong in grey colours
Bireflectance:
Strong
Reflectivity:
Wavelength | R1 | R2 |
---|---|---|
460nm | 14.4% | 15.8% |
540nm | 15.7% | 17.6% |
580nm | 16.2% | 18.2% |
640nm | 16.6% | 18.6% |
Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is 18.6%.
R1 shown in black, R2 shown in red
Colour in reflected light:
grey
Internal Reflections:
None
Pleochroism:
Visible
Comments:
Gray colors
Chemistry of Cronusite
Mindat Formula:
Ca0.2CrS2 · 2 H2O
Crystallography of Cronusite
Crystal System:
Trigonal
Class (H-M):
3m - Ditrigonal Pyramidal
Space Group:
R3m
Cell Parameters:
a = 3.326 Å, c = 33.29 Å
Ratio:
a:c = 1 : 10.009
Unit Cell V:
318.9 ų
Z:
3
Morphology:
grains up to 1 mm in size
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
11.1 Å | (100) |
5.56 Å | (10) |
3.700 Å | (4) |
2.179 Å | (5) |
2.464 Å | (4) |
2.180 Å | (4) |
Geological Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
Stage 7: Great Oxidation Event | <2.4 |
47i : [Terrestrial weathering of meteorites] |
Type Occurrence of Cronusite
General Appearance of Type Material:
Black grains, to 1 mm, disseminated in enstatite
Place of Conservation of Type Material:
Mining Museum of the Mining Institute, Saint Petersburg, Russia.
Geological Setting of Type Material:
Terrestrial weathering product of caswellsilverite
Associated Minerals at Type Locality:
Reference:
Britvin, S.N., Guo, X.Y., Kolomensky, V.D., Boldyreva, M.M., Kretser, Yu.L., Yagovinka, M.A. (2001) Cronusite, Ca0.2(H2O)2CrS2, a new mineral from the Norton County enstatite achondrite. Zapiski Vserossiyskogo Mineralogicheskogo Obshchestva: 130/3: 29-36.
Synonyms of Cronusite
Other Language Names for Cronusite
Related Minerals - Strunz-mindat Grouping
2.FB.05 | Caswellsilverite | NaCrS2 |
2.FB.05 | Schöllhornite | Na0.3CrS2 · H2O |
2.FB.10 | Chvilevaite | Na(Cu,Fe,Zn)2S4 |
2.FB.15 | Orickite | 2CuFeS2 · H2O |
2.FB.20 | Rasvumite | KFe2S3 |
2.FB.20 | Pautovite | CsFe2S3 |
2.FB.25 | Colimaite | K3VS4 |
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 Cronusite
mindat.org URL:
https://www.mindat.org/min-11188.html
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Please feel free to link to this page.
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References for Cronusite
Reference List:
Britvin, S. N., Guo, X. Y., Kolomensky, V. D., Boldyreva, M. M., Kretser, Yu.L., Yagovinka, M. A. (2001) Cronusite, Ca0.2(H2O)2CrS2, a new mineral from the Norton County enstatite achondrite. Zapiski Vserossijskogo Mineralogicheskogo Obshchestva, 130 (3) 29-36
Localities for Cronusite
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.
USA (TL) | |
| Britvin et al. (2001) |
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Norton County meteorite, Norton County, Kansas, USA