Mineralogy Database

Caswellsilverite Mineral Data

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General Caswellsilverite Information

Help on Chemical  Formula: Chemical Formula: NaCrS2
Help on Composition: Composition: Molecular Weight = 139.12 gm
   Sodium    16.53 %  Na
   Chromium  37.38 %  Cr
   Sulfur    46.10 %  S
            100.00 % 
Help on Empirical Formula: Empirical Formula: NaCrS2
Help on Environment: Environment: As inclusions in enstatite crystals and in the brecciated matrix of a meteorite.
Help on IMA Status: IMA Status: Approved IMA 1982
Help on Locality: Locality: In the Norton County enstatite achondrite and the Qingzhen enstatite chondrite meteorites. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: To honor Dr. Caswell Silver, geologist associated with the University of New Mexico, Albuquerque, New Mexico, USA.
Help on Synonym: Synonym: ICSD 200982
  PDF 10-292

Caswellsilverite Image

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Comments: B&W PPL image showing anhedral grain of caswellsilverite (Cw) associated with daubrdelite (Db), ferromagnesian alabandite (Ab) and kamacite (Km), containing perryite (Pr), as well as enstatite (En).
Location: Norton County enstatite achondrite meteorite. (AmMin, v67:132). Scale: Scale Bar 0.1 mm.
© American Mineralogist

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  Schollhornite   Daubreelite   Caswellsilverite

Comments: Polished section (PPL) of schiillhornite (Sh), coexisting with caswellsilverite (Cw), ferromagnesian alabandite (Ab) and daubreelite (Db). (AmMin, v70:638).
Location: Norton County (Kansas-Nebraska) enstatite achondrite meteorite. Scale: Scale bar is 0.08 mm.
© American Mineralogist

Caswellsilverite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:5.49295
Help on Cell Dimensions: Cell Dimensions: a = 3.55, c = 19.5, Z = 3; V = 212.82 Den(Calc)= 3.26
Help on Crystal System: Crystal System: Trigonal - Hexagonal Scalenohedral H-M Symbol (3 2/m) Space Group: R 3m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.6(1), 1.91(0.8), 2.07(0.8),

Physical Properties of Caswellsilverite

Help on Color: Color: Yellow gray.
Help on Density: Density: 3.21
Help on Diaphaneity: Diaphaneity: Opaque
Help on Hardness: Hardness: 1-2 - Between Talc and Gypsum
Help on Luster: Luster: Metallic

Optical Properties of Caswellsilverite

Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Caswellsilverite in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 400 nm   26.70   19.30 
 420 nm   26.20   20.10 
 440 nm   26.30   21.90 
 460 nm   27.40   21.50 
 480 nm   30.00   21.70 
 500 nm   31.60   22.00 
 520 nm   32.30   22.00 
 540 nm   32.80   21.80 
 560 nm   33.00   21.70 
 580 nm   32.50   21.30 
 600 nm   32.20   20.80 
 620 nm   31.40   20.50 
 640 nm   30.70   20.50 
 660 nm   29.40   20.10 
 680 nm   28.70   18.10 
 700 nm   28.80   18.00 
Calculated Relative Intensity Colors of Caswellsilverite in Air
   0%   50% 100% 150% 200% 250% 300% 350% 400% 440%

Calculated Properties of Caswellsilverite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.14 gm/cc
note: Specific Gravity of Caswellsilverite =3.26 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.03
Boson Index = 0.97
Help on Photoelectric: Photoelectric: PECaswellsilverite = 11.15 barns/electron
U=PECaswellsilverite x rElectron Density= 35.00 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Caswellsilverite is Not Radioactive

Caswellsilverite 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 Caswellsilverite Information

Help on References: References: NAME( AntBidBlaNic1) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Caswellsilverite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Dana No: Strunz No: 02.FB.05





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