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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.
This page provides mineralogical data about Caswellsilverite.


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Classification of CaswellsilveriteHide

Approved
First Published:
1982
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

Physical Properties of CaswellsilveriteHide

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

Optical Data of CaswellsilveriteHide

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 CaswellsilveriteHide

Formula:
NaCrS2
Common Impurities:
Fe,Ca,Mg,Mn,Ti

Crystallography of CaswellsilveriteHide

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 CaswellsilveriteHide

Geological Setting of Type Material:
Enstatite achondrite
Associated Minerals at Type Locality:

Synonyms of CaswellsilveriteHide

Other Language Names for CaswellsilveriteHide

Simplified Chinese:硫钠铬矿
Traditional Chinese:硫鈉鉻礦

Common AssociatesHide

Kamacite(Fe,Ni)
Oldhamite(Ca,Mg)S
TroiliteFeS

Related Minerals - Nickel-Strunz GroupingHide

2.FB.05SchöllhorniteNa0.3CrS2 · H2OTrig.
2.FB.05CronusiteCa0.2CrS2 · 2 H2OTrig. 3m : R3m
2.FB.10ChvilevaiteNa(Cu,Fe,Zn)2S4Trig. 3m : R3m
2.FB.15Orickite2CuFeS2 · H2OHex.
2.FB.20RasvumiteKFe2S3Orth. mmm (2/m 2/m 2/m) : Cmcm
2.FB.20PautoviteCsFe2S3Orth. mmm (2/m 2/m 2/m) : Cmcm
2.FB.25ColimaiteK3VS4Orth. mmm (2/m 2/m 2/m) : Pnma

Related Minerals - Dana Grouping (8th Ed.)Hide

2.9.17.2SchöllhorniteNa0.3CrS2 · H2OTrig.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

3.8.1BrezinaiteCr3S4Mon. 2/m
3.8.3KalininiteZnCr2S4
3.8.4DaubréeliteFe2+Cr3+2S4Iso. m3m (4/m 3 2/m) : Fd3m
3.8.5Heideite(Fe,Cr)1.15(Ti,Fe)2S4Mon. 2/m
3.8.6MolybdeniteMoS2Hex. 6/mmm (6/m 2/m 2/m) : P63/mmc
3.8.7 Molybdenite-3RMoS2Trig. 3m : R3m
3.8.8JordisiteMoS2
3.8.9DrysdalliteMo(Se,S)2Hex. 6/mmm (6/m 2/m 2/m) : P63/mmc
3.8.10TungsteniteWS2Trig. 3m : R3m
3.8.12AlabanditeMnSIso. m3m (4/m 3 2/m) : Fm3m
3.8.13HaueriteMnS2Iso. m3 (2/m 3) : Pa3
3.8.14Manganoshadlunite(Mn,Pb,Cd)(Cu,Fe)8S8

Other InformationHide

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 CaswellsilveriteHide

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 CaswellsilveriteHide

Localities for CaswellsilveriteHide

This 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.

Locality ListHide

- 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). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Antarctica
 
  • Eastern Antarctica
    • Queen 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 (TL)
 
  • Kansas
    • Norton Co.
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.
  • 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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