Caswellsilverite Mineral Data

General Caswellsilverite Information

Chemical Formula:

NaCrS2

Composition:

Molecular Weight = 139.12 gm

Sodium 16.53 % Na

Chromium 37.38 % Cr

Sulfur 46.10 % S

______

100.00 %

Empirical Formula:

NaCrS₂

Environment:

As inclusions in enstatite crystals and in the brecciated matrix of a meteorite.

IMA Status:

Approved IMA 1982

Locality:

In the Norton County enstatite achondrite and the Qingzhen enstatite chondrite meteorites. Link to MinDat.org Location Data.

Name Origin:

To honor Dr. Caswell Silver, geologist associated with the University of New Mexico, Albuquerque, New Mexico, USA.

Synonym:

ICSD 200982

PDF 10-292

Caswellsilverite Image

Images:

Caswellsilverite

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

Images:

Caswellsilverite Schollhornite Daubreelite

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

Axial Ratios:

a:c = 1:5.49295

Cell Dimensions:

a = 3.55, c = 19.5, Z = 3; V = 212.82 Den(Calc)= 3.26

Crystal System:

Trigonal - Hexagonal ScalenohedralH-M Symbol (3 2/m) Space Group: R 3m

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.6(1), 1.91(0.8), 2.07(0.8),

Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

Engelsman F M R , Wiegers G A , Jellinek F , VanLaar B , Journal of Solid State Chemistry , 6 (1973) p.574-582, Crystal structures and magnetic structures of some metal chromium(III) sulfides and selenides, Locality: synthetic, Sample: T = 300 K

Physical Properties of Caswellsilverite

Color:

Yellow gray.

Density:

3.21

Diaphaneity:

Opaque

Hardness:

1-2 - Between Talc and Gypsum

Luster:

Metallic

Optical Properties of Caswellsilverite

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**
Relative Intensity	0%	50%	100%	150%	200%	250%	300%	350%	400%	440%
R₁
R₂

Calculated Properties of Caswellsilverite

Electron Density:

Bulk Density (Electron Density)=3.14 gm/cc
note: Specific Gravity of Caswellsilverite =3.26 gm/cc.

Fermion Index:

Fermion Index = 0.03
Boson Index = 0.97

Photoelectric:

PE_{Caswellsilverite}= 11.15 barns/electron
U=PE_{Caswellsilverite} x rElectron Density= 35.00 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Caswellsilverite is Not Radioactive

Caswellsilverite Classification

Dana Class:

02.09.17.01 (02)Sulfides - Including Selenides and Tellurides

(02.09)where Am Bn Xp, with (m+n):p=1:1

(02.09.17)Caswellsilverite Group

02.09.17.01 Caswellsilverite NaCrS2 R 3m 3 2/m

02.09.17.02 Schollhornite Na0.3CrS2•(H2O) R 3m ? 3m

02.09.17.03 Cronusite! Ca0.2(H2O)2CrS2 Rm, R 3m or R 32 Trig

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

References:

NAME( AntBidBlaNic1) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990)

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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Print or Cut-and-Paste your Caswellsilverite Specimen Label here :

Caswellsilverite

NaCrS2
Dana No: 02.09.17.01 Strunz No: 02.FB.05
Locality:

Notes: