Caswellsilverite
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Caswell Silver
Formula:
NaCrS2
Colour:
Yellowish-grey, Grey
Lustre:
Metallic
Hardness:
2
Specific Gravity:
3.23 (Calculated)
Crystal System:
Trigonal
Name:
Named by Akihiko Okada and Klaus Keil in 1982 in honor of Caswell Silver (25 June 1916, New York City, New York, USA – 18 October 1988), geologist and President of the Sundance Oil Company from 1960-1984. He was an alumnus and benefactor of the Department of Geology and Institute of Meteoritics at the University of New Mexico.
Type Locality:
This page provides mineralogical data about Caswellsilverite.
Classification of Caswellsilverite
Approved
First Published:
1982
2/F.08-10
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.)
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.)
2.9.17.1
2 : SULFIDES
9 : AmBnXp, with (m+n):p = 1:1
2 : SULFIDES
9 : AmBnXp, with (m+n):p = 1:1
3.8.2
3 : Sulphides, Selenides, Tellurides, Arsenides and Bismuthides (except the arsenides, antimonides and bismuthides of Cu, Ag and Au, which are included in Section 1)
8 : Sulphides etc. of Cr, Mo, W an Mn
3 : Sulphides, Selenides, Tellurides, Arsenides and Bismuthides (except the arsenides, antimonides and bismuthides of Cu, Ag and Au, which are included in Section 1)
8 : Sulphides etc. of Cr, Mo, W an Mn
Physical Properties of Caswellsilverite
Metallic
Transparency:
Opaque
Colour:
Yellowish-grey, Grey
Hardness:
2 on Mohs scale
Hardness:
VHN15=17 - 45 kg/mm2 - Vickers
Comment:
Vickers hardness on synthetic material
Density:
3.23 g/cm3 (Calculated)
Optical Data of Caswellsilverite
Type:
Anisotropic
Anisotropism:
Strong
Bireflectance:
Strong
Colour in reflected light:
Yellow-gray to light gray
Pleochroism:
Visible
Comments:
Pale yellow to gray in air, pale yellow with greenish tint to gray in oil.
Chemical Properties of Caswellsilverite
Formula:
NaCrS2
Elements listed:
Common Impurities:
Fe,Ca,Mg,Mn,Ti
Crystallography of Caswellsilverite
Crystal System:
Trigonal
Class (H-M):
3m (3 2/m) - Hexagonal Scalenohedral
Space Group:
R3m
Setting:
R3m
Cell Parameters:
a = 3.54 Å, c = 19.35 Å
Ratio:
a:c = 1 : 5.466
Unit Cell V:
210.00 ų (Calculated from Unit Cell)
Z:
3
Morphology:
Anhedral grains to 1mm
Twinning:
Lamellar twinning (may be result of pressure induce deformation)
Type Occurrence of Caswellsilverite
Geological Setting of Type Material:
Enstatite achondrite
Associated Minerals at Type Locality:
Synonyms of Caswellsilverite
Other Language Names for Caswellsilverite
German:Caswellsilverit
Russian:Касуэллсилверит
Simplified Chinese:硫钠铬矿
Spanish:Caswellsilverita
Traditional Chinese:硫鈉鉻礦
Common Associates
Related Minerals - Nickel-Strunz Grouping
| 2.FB.05 | Schöllhornite | Na0.3CrS2 · H2O | Trig. |
| 2.FB.05 | Cronusite | Ca0.2CrS2 · 2 H2O | Trig. 3m : R3m |
| 2.FB.10 | Chvilevaite | Na(Cu,Fe,Zn)2S4 | Trig. 3m : R3m |
| 2.FB.15 | Orickite | 2CuFeS2 · H2O | Hex. |
| 2.FB.20 | Rasvumite | KFe2S3 | Orth. mmm (2/m 2/m 2/m) : Cmcm |
| 2.FB.20 | Pautovite | CsFe2S3 | Orth. mmm (2/m 2/m 2/m) : Cmcm |
| 2.FB.25 | Colimaite | K3VS4 | Orth. mmm (2/m 2/m 2/m) : Pnma |
Related Minerals - Dana Grouping (8th Ed.)
| 2.9.17.2 | Schöllhornite | Na0.3CrS2 · H2O | Trig. |
Related Minerals - Hey's Chemical Index of Minerals Grouping
| 3.8.1 | Brezinaite | Cr3S4 | Mon. 2/m |
| 3.8.3 | Kalininite | ZnCr2S4 | |
| 3.8.4 | Daubréelite | Fe2+Cr3+2S4 | Iso. m3m (4/m 3 2/m) : Fd3m |
| 3.8.5 | Heideite | (Fe,Cr)1.15(Ti,Fe)2S4 | Mon. 2/m |
| 3.8.6 | Molybdenite | MoS2 | Hex. 6/mmm (6/m 2/m 2/m) : P63/mmc |
| 3.8.7 | Molybdenite-3R | MoS2 | Trig. 3m : R3m |
| 3.8.8 | Jordisite | MoS2 | |
| 3.8.9 | Drysdallite | Mo(Se,S)2 | Hex. 6/mmm (6/m 2/m 2/m) : P63/mmc |
| 3.8.10 | Tungstenite | WS2 | Trig. 3m : R3m |
| 3.8.12 | Alabandite | MnS | Iso. m3m (4/m 3 2/m) : Fm3m |
| 3.8.13 | Hauerite | MnS2 | Iso. m3 (2/m 3) : Pa3 |
| 3.8.14 | Manganoshadlunite | (Mn,Pb,Cd)(Cu,Fe)8S8 |
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
References for Caswellsilverite
Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Engelsman, F.M.R., Wiegers, G.A., Jellinek, F., van Laar, B. (1973) Crystal structures and magnetic structures of some metal(I) chromium(III) sulfides and selenides. Journal of Solid State Chemistry: 6: 574-582.
Okada, A., Keil, K. (1982) Caswellsilverite, NaCrS2: a new mineral in the Norton County enstatite achondrite. American Mineralogist: 67: 132-136.
Fleischer, M., Chao, G.Y., Mandarino, J.A. (1982) New mineral names. American Mineralogist: 67: 854-860.
Internet Links for Caswellsilverite
mindat.org URL:
https://www.mindat.org/min-918.html
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External Links:
Mineral Dealers:
Localities for Caswellsilverite
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
Antarctica | |
| Brearley, A. J. & Jones, R. H. (1998): Chondritic Meteorites. In: Planetary Materials (Papike, J. J., Editor): Chapter 3, 398 pages. Mineralogical Society of America: Washington, DC, USA. (1998) |
China | |
| Handbook of Mineralogy |
India | |
| Nehru, C. E., Prinz, M., Weisberg, M. K. & Delaney, J. S. (1984) Parsa: an Unequilibrated Enstatite Chondrite (uec) with an Aubrite-Like Impact Melt Clast (abstract), Lunar and Planetary Science XV, 597-598. (March 1984) |
USA (TL) | |
| Am Min 67:132-136; Okada, A., Keil, K., Leonard, B. F., & Hutcheon, I. D. (1984). Schöllhornite, Na0. 3 (H2O) 1 [CrS2] a New Mineral in the Norton County Enstatite Achondrite. Meteoritics, 19, 284. |
| Fahey, A., Gary R. Huss, Gerald J. Wasserburg & Katherina Lodders (1995). REE Abundances and CR Isotopic Composition of Oldhamite and Associate Minerals from the Pena Blanca Spring Aubrite. Abstracts of the Lunar and Planetary Science Conference, vol. 26, p. 385. |