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Cronusite
A valid IMA mineral species
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About Cronusite
Kronos
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
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 for Standard |
|---|---|---|
| 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). 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
Element Weights:
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:
Synonyms of Cronusite
Other Language Names for Cronusite
Related Minerals - Strunz-mindat Grouping
| 2.FB.05 | Schöllhornite | Na0.3CrS2 · H2O |
| 2.FB.05 | Caswellsilverite | NaCrS2 |
| 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
Please feel free to link to this page.
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
Showing 1 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.
USA (TL) | |
| Britvin et al. (2001) |
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Norton County meteorite, Norton County, Kansas, USA