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Cronusite

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Kronos
Formula:
Ca0.2CrS2 · 2 H2O
Colour:
Black
Lustre:
Sub-Metallic
Hardness:
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.
Found in an enstatite achondrite meteorite with other chromium-rich minerals.
Schöllhornite has probably formed by terrestrial weathering of caswellsilverite.


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Classification of CronusiteHide

Approved
Approval Year:
1999
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.)

Physical Properties of CronusiteHide

Sub-Metallic
Transparency:
Opaque
Colour:
Black
Streak:
Black
Hardness:
1½ on Mohs scale
Hardness Data:
Measured
Cleavage:
Perfect
(001)
Density:
2.51 g/cm3 (Measured)    2.55 g/cm3 (Calculated)

Optical Data of CronusiteHide

Type:
Anisotropic
Anisotropism:
strong in grey colours
Colour in reflected light:
grey

Chemical Properties of CronusiteHide

Formula:
Ca0.2CrS2 · 2 H2O
IMA Formula:
Ca0.2CrS2 · 2H2O

Crystallography of CronusiteHide

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

Type Occurrence of CronusiteHide

Geological Setting of Type Material:
terrestrial weathering product of Caswellsilverite

Synonyms of CronusiteHide

Other Language Names for CronusiteHide

German:Cronusit
Simplified Chinese:硫钙水铬矿
Spanish:Cronusita
Traditional Chinese:硫鈣水鉻礦

Related Minerals - Nickel-Strunz GroupingHide

2.FB.05CaswellsilveriteNaCrS2Trig. 3m (3 2/m) : R3m
2.FB.05SchöllhorniteNa0.3CrS2 · H2OTrig.
2.FB.10ChvilevaiteNa(Cu,Fe,Zn)2S4Trig. 3m : R3m
2.FB.15Orickite2CuFeS2 · H2OHex.
2.FB.20RasvumiteKFe2S3Orth. mmm (2/m 2/m 2/m) : Cmcm
2.FB.20PautoviteCsFe2S3Orth. mmm (2/m 2/m 2/m) : Cmcm
2.FB.25ColimaiteK3VS4Orth. mmm (2/m 2/m 2/m) : Pnma

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for CronusiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
S.N. Britvin, X.Y. Guo, V.D. Kolomensky, M.M. Boldyreva, Yu.L. Kretser & M.A. Yagovinka (2001): Cronusite, Ca0.2(H2O)2CrS2, a new mineral from the Norton County enstatite achondrite. - Zapiski Vserossiyskogo Mineralogicheskogo Obshchestva: 130/3, 29-36 (in Russian).

Internet Links for CronusiteHide

Localities for CronusiteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
USA (TL)
 
  • Kansas
    • Norton Co.
S.N. Britvin et al. (2001) Zap. Vser. Mineral. Obshch. 130/3, 29-36 (in russ.)
Mineral and/or Locality  
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