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Caswellsilverite

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Caswell Silver
Formula:
NaCrS2
System:
Trigonal
Colour:
Yellowish-grey, Grey
Lustre:
Metallic
Hardness:
2
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.


Classification of Caswellsilverite

IMA status:
Approved
First Published:
1982
Strunz 8th ed.:
2/F.08-10
Nickel-Strunz 10th (pending) ed.:
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.)
Dana 8th ed.:
2.9.17.1

2 : SULFIDES
9 : AmBnXp, with (m+n):p = 1:1
Hey's CIM Ref.:
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 Caswellsilverite

Lustre:
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)

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 in formula:
Cr, Na, S - search for minerals with similar chemistry
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
Space Group Setting:
R3m
Cell Parameters:
a = 3.54 Å, c = 19.35 Å
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)

Occurrences of Caswellsilverite

Type Occurrence of Caswellsilverite

Type Locality:
ⓘ Norton County meteorite, Norton Co., Kansas, USA
Geological Setting of Type Material:
Enstatite achondrite
Associated Minerals at Type Locality:
DaubréeliteDaubréeliteDaubréeliteOldhamiteKamacite
Perryite

Relationship of Caswellsilverite to other Species

Common Associates:
Kamacite
Oldhamite
Troilite
Related Minerals - Nickel-Strunz Grouping):
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
Related Minerals - Hey's Index Grouping:
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

Synonyms:

IMA1981-012

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:
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

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    • Localities for Caswellsilverite

    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.
    (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 (TL)
     
    • 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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