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Caswellsilverite

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Caswell Silver
Formula:
NaCrS2
System:
Trigonal
Colour:
Yellowish-grey, Grey
Lustre:
Metallic
Hardness:
2
Name:
For Dr. Caswell Silver (1916-1988), American geologist associated with the University of New Mexico, Institute of Meteoritics, Albuquerque, New Mexico, USA.
This page provides mineralogical data about Caswellsilverite.

Classification of Caswellsilverite

Approved
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.)
2.9.17.1

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
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First Recorded Occurrence of Caswellsilverite

Year of Discovery:
1982
Geological Setting of First Recorded Material:
Enstatite achondrite

Occurrences of Caswellsilverite

Geological Setting:
Meteorites

Physical Properties of Caswellsilverite

Metallic
Diaphaneity (Transparency):
Opaque
Colour:
Yellowish-grey, Grey
Hardness (Mohs):
2
Hardness (Vickers):
VHN15=17 - 45 kg/mm2
Comment:
Vickers hardness on synthetic material
Density:
3.23 g/cm3 (Calculated)

Crystallography of Caswellsilverite

Crystal System:
Trigonal
Class (H-M):
3m (3 2/m) - Hexagonal Scalenohedral
Space Group:
R3m
Space Group Setting:
R3m
Cell Parameters:
a = 3.54Å, c = 19.35Å
Ratio:
a:c = 1 : 5.466
Unit Cell Volume:
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)

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
Essential elements:
All elements listed in formula:
Common Impurities:
Fe,Ca,Mg,Mn,Ti

Relationship of Caswellsilverite to other Species

Common Associates:
2.FB.05SchöllhorniteNa0.3CrS2 · H2O
2.FB.05CronusiteCa0.2CrS2 · 2 H2O
2.FB.10ChvilevaiteNa(Cu,Fe,Zn)2S4
2.FB.15Orickite2CuFeS2 · H2O
2.FB.20RasvumiteKFe2S3
2.FB.20PautoviteCsFe2S3
2.FB.25ColimaiteK3VS4
3.8.1BrezinaiteCr3S4
3.8.3KalininiteZnCr2S4
3.8.4DaubréeliteFe2+Cr23+S4
3.8.5Heideite(Fe,Cr)1.15(Ti,Fe)2S4
3.8.6MolybdeniteMoS2
3.8.7 Molybdenite-3RMoS2
3.8.8JordisiteMoS2
3.8.9DrysdalliteMo(Se,S)2
3.8.10TungsteniteWS2
3.8.12AlabanditeMnS
3.8.13HaueriteMnS2
3.8.14Manganoshadlunite(Mn,Pb,Cd)(Cu,Fe)8S8

Other Names for Caswellsilverite

Name in Other Languages:
Simplified Chinese:硫钠铬矿
Traditional Chinese:硫鈉鉻礦

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:
American Mineralogist: 67: 132-136.

Internet Links for Caswellsilverite

Localities for Caswellsilverite

map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Antarctica
 
  • Eastern Antarctica
    • Queen Maud Land (Dronning Maud Land)
      • Queen Fabiola Mts (Yamato Mts)
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
 
  • Guizhou Province
    • Guiyang Prefecture
      • Qingzhen Co.
Handbook of Mineralogy
India
 
  • Bihar
    • Muzaffarpur
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
 
  • Kansas
    • Norton Co.
Am Min 67:132-136
  • Texas
    • Brewster Co.
      • Marathon
        • Gage Ranch
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.
Mineral and/or Locality  
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