Mineralogy Database

Cronusite Mineral Data

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General Cronusite Information

Help on Chemical  Formula: Chemical Formula: Ca0.2(H2O)2CrS2
Help on Composition: Composition: Molecular Weight = 161.98 gm
   Calcium    4.95 %  Ca
   Chromium  32.10 %  Cr
   Hydrogen   2.61 %  H
   Sulfur    39.59 %  S
   Oxygen    20.74 %  O
            100.00 % 
Help on Empirical Formula: Empirical Formula: Ca0.2(H2O)2.1CrS2
Help on Environment: Environment: Derived from the weathering of caswellsilverite and disseminated in enstatite. Close to sch´┐Żllhornite.
Help on IMA Status: IMA Status: Approved IMA 2002 (Dana # Added)
Help on Locality: Locality: Norton County enstatite achondrite meteorite, Kansas, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Name derived from the Greek Titan "Cronos" and alludes to the combined meteor-terrestrial origin where cronusite is derived from terretrial weathering of meteoric minerals.
Help on Synonym: Synonym: IMA1999-018

Cronusite Image

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Comments: Light gray grain of cronusite. Polished section (from microprobe analysis) in reflected light.
Location: Enstatite meteorite, Norton Co., Kansas, USA. Scale: Picture size 0.18 mm.
© Thomas Witzke / Abraxas-Verlag

Cronusite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:10.00901
Help on Cell Dimensions: Cell Dimensions: a = 3.326, c = 33.29, Z = 3; V = 318.93 Den(Calc)= 2.53
Help on Crystal System: Crystal System: Trigonal Space Group: Rm, R 3m or R 32
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 11.1(1)(003), 2.719(0.5)(104), 2.18(0.49)(1.1.10),2.464(0.4)(107), 3.7(0.4)(009), 5.56(0.1)(006),

Physical Properties of Cronusite

Help on Cleavage: Cleavage: {001} Perfect
Help on Color: Color: Coal black.
Help on Density: Density: 2.51
Help on Diaphaneity: Diaphaneity: Opaque
Help on Fracture: Fracture: Sectile - Curved shavings or scrapings produced by a knife blade, (e.g. graphite).
Help on Habit: Habit: Granular - Generally occurs as anhedral to subhedral crystals in matrix.
Help on Habit: Habit: Inclusions - Generally found as inclusions in other minerals.
Help on Hardness: Hardness: 1.5 - Between Talc and Gypsum
Help on Luster: Luster: Sub Metallic
Help on Streak: Streak: black

Optical Properties of Cronusite

Help on RL Anisotrophism: RL Anisotrophism: Strong.
Help on RL Bireflectance: RL Bireflectance: Strong.
Help on RL Color: RL Color: Gray with no internal reflections.
Help on RL Pleochroism: RL Pleochroism: In gray polarization colors.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Cronusite in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 460 nm   14.40   15.80 
 540 nm   15.70   17.60 
 580 nm   16.20   18.20 
 640 nm   16.60   18.60 
Calculated Relative Intensity Colors of Cronusite in Air
   0%   70% 100% 140% 210% 280% 350% 420% 490% 560% 610%

Calculated Properties of Cronusite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.53 gm/cc
note: Specific Gravity of Cronusite =2.53 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.03
Boson Index = 0.97
Help on Photoelectric: Photoelectric: PECronusite = 9.72 barns/electron
U=PECronusite x rElectron Density= 24.59 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Cronusite is Not Radioactive

Cronusite Classification

Help on  Dana Class: Dana Class: (02)Sulfides - Including Selenides and Tellurides
  (02.09)where Am Bn Xp, with (m+n):p=1:1
  (02.09.17)Caswellsilverite Group Caswellsilverite NaCrS2 R 3m 3 2/m Schollhornite Na0.3CrS2•(H2O) R 3m ? 3m Cronusite! Ca0.2(H2O)2CrS2 Rm, R 3m or R 32 Trig
Help on  Strunz Class: Strunz Class: 02.FB.05 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf
  02.F - Sulfides of Arsenic, Alkalies; Sulfides with Halide, Oxide, Hydroxide, H2O
  02.FB -With Alkalies (without Cl, etc.)
02.FB.05 Caswellsilverite NaCrS2 R 3m 3 2/m
02.FB.05 Schollhornite Na0.3CrS2•(H2O) R 3m ? 3m
02.FB.05 Cronusite! Ca0.2(H2O)2CrS2 Rm, R 3m or R 32 Trig

Other Cronusite Information

Help on References: References: NAME( AmMin, Vol 87, p 1510) PHYS. PROP.(AmMin, Vol 87, p 1510) OPTIC PROP.(AmMin, Vol 87, p 1510)
Help on See Also: See Also: Links to other databases for Cronusite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - Handbook of Mineralogy (MinSocAm)
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info

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Dana No: Strunz No: 02.FB.05





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