Mindat Logo

Caswellsilverite

This page is currently not sponsored. Click here to sponsor this page.



Formula:
NaCrS
 
2
System:TrigonalColour:Yellowish-grey, Grey
Lustre:MetallicHardness: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

IMA status:Approved
Strunz 8th edition ID:2/F.08-10
Nickel-Strunz 10th (pending) edition ID: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 edition ID: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
mindat.org URL:http://www.mindat.org/min-918.html
Please feel free to link to this page.

Type Occurrence of Caswellsilverite

Type Locality:Norton County meteorite, Norton Co., Kansas, USA
Year of Discovery:1982
Geological Setting of type material:Enstatite achondrite

Occurrences of Caswellsilverite

Geological Setting:Meteorites

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 (calculated):3.23 g/cm3

Crystallography of Caswellsilverite

Crystal System:Trigonal
Class (H-M):3m (3 2/m) - Hexagonal Scalenohedral
Space Group:R3m {R3 2/m}
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:
NaCrS
 
2
Simplified for copy/paste:NaCrS2
Essential elements:Cr, Na, S
All elements listed in formula:Cr, Na, S
Common Impurities:Fe,Ca,Mg,Mn,Ti

Relationship of Caswellsilverite to other Species

Common Associates:
TroiliteOldhamiteKamacite
Related Minerals - Nickel-Strunz Grouping):

- +
2.FB.05Schöllhornite
Na
 
0.3
CrS
 
2
· H
 
2
O
2.FB.05Cronusite
Ca
 
0.2
CrS
 
2
· 2 H
 
2
O
2.FB.10Chvilevaite
Na(Cu,Fe,Zn)
 
2
S
 
4
2.FB.15Orickite
2CuFeS
 
2
· H
 
2
O
2.FB.20Rasvumite
KFe
 
2
S
 
3
2.FB.20Pautovite
CsFe
 
2
S
 
3
2.FB.25Colimaite
K
 
3
VS
 
4
Related Minerals - Hey's Index Grouping:

- +
3.8.1Brezinaite
Cr
 
3
S
 
4
3.8.3Kalininite
ZnCr
 
2
S
 
4
3.8.4Daubréelite
Fe
2+
 
Cr
3+
2
S
 
4
3.8.5Heideite
(Fe,Cr)
 
1.15
(Ti,Fe)
 
2
S
 
4
3.8.6Molybdenite
MoS
 
2
3.8.7 Molybdenite-3R
MoS
 
2
3.8.8Jordisite
MoS
 
2
3.8.9Drysdallite
Mo(Se,S)
 
2
3.8.10Tungstenite
WS
 
2
3.8.12Alabandite
Mn
2+
 
S
3.8.13Hauerite
MnS
 
2
3.8.14Manganoshadlunite
(Mn,Pb,Cd)(Cu,Fe)
 
8
S
 
8

Other Names for Caswellsilverite

Synonyms:
IMA1981-012
Other Languages:
German:Caswellsilverit
Russian:Касуэллсилверит
Simplified Chinese:硫钠铬矿
Spanish:Caswellsilverita
Traditional Chinese:硫鈉鉻礦

Other Information

Health Warning: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

Search Engines:
  • Look for Caswellsilverite on Google
  • Look for Caswellsilverite images on Google
  • External Links:
  • Look for Caswellsilverite on Webmineral
  • Look for Caswellsilverite on Athena Mineralogy
  • Look for Caswellsilverite on Mineralien Atlas
  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Caswellsilverite details from Handbook of Mineralogy (PDF)
  • Mineral Dealers:
  • Find Caswellsilverite on www.crystalclassics.co.uk
  • Fine Minerals from Weinrich Minerals, Inc.
  • Search for Caswellsilverite on Well-Arranged Molecules
  • Buy rare minerals from Excalibur Minerals
  • Buy fine minerals and gemstones from Pala International
  • The Arkenstone - Fine Minerals
  • Buy from Dave Bunk Minerals
  • Buy from McDougall Minerals
  • Buy RARE Minerals from Rocks of Africa
  • Rare and Unusual minerals at Mineralogical Research Company
  • DAKOTA MATRIX offers Cabinet and Rare Species from Worldwide Localities.
  • Buy from David K Joyce minerals
  • Jobs:
  • Mining & Geology Jobs
  • Localities for Caswellsilverite

    The 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. ? 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.
    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  
    Search Google  
    Copyright © Jolyon Ralph and Ida Chau 1993-2014. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of thousands of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
    Current server date and time: April 1, 2014 09:15:46
    Mineral and Locality Search
    Mineral:
    and/or Locality:
    Options
    Fade toolbar when not in focusFix toolbar to bottom of page
    Hide Social Media Links
    Slideshow frame delay seconds