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Cronusite

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Formula:
Ca
 
0.2
CrS
 
2
· 2 H
 
2
O
System:TrigonalColour:Black
Lustre:Sub-MetallicHardness:
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.

Classification of Cronusite

IMA status:Approved 1999
Nickel-Strunz 10th (pending) edition ID: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.)
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Type Occurrence of Cronusite

Type Locality:Norton County meteorite, Norton Co., Kansas, USA
Geological Setting of type material:terrestrial weathering product of Caswellsilverite

Physical Properties of Cronusite

Lustre:Sub-Metallic
Diaphaneity (Transparency):Opaque
Colour:Black
Streak:Black
Hardness (Mohs):
Hardness Data:Measured
Cleavage:Perfect
(001)
Density (measured):2.51 g/cm3
Density (calculated):2.55 g/cm3

Crystallography of Cronusite

Crystal System:Trigonal
Class (H-M):3m - Ditrigonal Pyramidal
Space Group:R3m
Cell Parameters:a = 3.326Å, c = 33.29Å
Ratio:a:c = 1 : 10.009
Unit Cell Volume:V 318.9 ų
Z:3
Morphology:grains up to 1 mm in size

Optical Data of Cronusite

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

Chemical Properties of Cronusite

Formula:
Ca
 
0.2
CrS
 
2
· 2 H
 
2
O
Simplified for copy/paste:Ca0.2CrS2· 2 H2O
Essential elements:Ca, Cr, H, O, S
All elements listed in formula:Ca, Cr, H, O, S

Relationship of Cronusite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
2.FB.05Caswellsilverite
NaCrS
 
2
2.FB.05Schöllhornite
Na
 
0.3
CrS
 
2
· H
 
2
O
2.FB.10Chvilevaite
Na(Cu,Fe,Zn)
 
2
S
 
4
2.FB.15Orickite
2CuFeS
 
2
· H
 
2
O
2.FB.20Rasvumite
KFe
 
2
S
 
3
2.FB.20Pautovite
CsFe
 
2
S
 
3
2.FB.25Colimaite
K
 
3
VS
 
4

Other Names for Cronusite

Synonyms:
IMA1999-018
Other Languages:
German:Cronusit
Simplified Chinese:硫钙水铬矿
Spanish:Cronusita
Traditional Chinese:硫鈣水鉻礦

Other Information

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

References for Cronusite

Reference List:

- +
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 Cronusite

Search Engines:
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  • External Links:
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  • Look for Cronusite on Athena Mineralogy
  • Look for Cronusite on Mineralien Atlas
  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Cronusite details from Handbook of Mineralogy (PDF)
  • Mineral Dealers:
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  • Localities for Cronusite

    The 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.
    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    USA
     
    • Kansas
      • Norton Co.
    S.N. Britvin et al. (2001) Zap. Vser. Mineral. Obshch. 130/3, 29-36 (in russ.)
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