| |
 |
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:
|
|
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
|
| 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 Scalenohedral H-M Symbol (3 2/m) Space Group: R 3m |
| X Ray Diffraction: |
By Intensity(I/Io): 2.6(1), 1.91(0.8), 2.07(0.8), |
| |
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: |
PECaswellsilverite = 11.15 barns/electron
U=PECaswellsilverite 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
Search for Caswellsilverite using:
[AOL]
[Bing]
[Dog Pile]
[GeoScienceWorld]
[HotBot]
[Ixquick]
[Lycos]
[MAMMA]
[Scirus]
[Teoma]
[WebCrawler]
[Wikipedia]
[YAHOO]
Visit our Advertisers for Caswellsilverite :
Ask about Caswellsilverite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in
Espaņol
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:
|
|
| |
| |
|
| |
Dakota Matrix
Excalibur Minerals
Exceptional Minerals
Hudson Insitute
John Betts Fine Minerals
Mc Dougall Minerals
Mineral News
Rock and Mineral Shows
Weinrich Minerals, Inc.