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Calvertite

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Formula:
Cu
 
5
Ge
 
0.5
S
 
4
System:IsometricColour:Black
Hardness:4 - 5
Name:Named in honor of Lauriston D. Calvert (1924-1993) of the National Research Council, Ottawa, Canada.
This page provides mineralogical data about Calvertite.

Classification of Calvertite

IMA status:Approved 2006
Strunz 8th edition ID:2/B.02-35
Strunz 9th edition ID:2.BB.10
Nickel-Strunz 10th (pending) edition ID:2.CA.15

2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
C : Metal Sulfides, M: S = 1: 1 (and similar)
A : With Cu
Dana 8th edition ID:2.5.2.2

2 : SULFIDES
5 : AmBnXp, with (m+n):p = 3:2
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Type Occurrence of Calvertite

Type Locality:Tsumeb Mine (Tsumcorp Mine), Tsumeb, Otjikoto Region (Oshikoto), Namibia
Geological Setting of type material:Oxidized germanium rich ore
Associated Minerals at type locality:
ChalcociteDigeniteDjurleiteGoethiteHematite
QuartzSilverStolziteOtjisumeite

Physical Properties of Calvertite

Lustre:Metallic
Diaphaneity (Transparency):Opaque
Colour:Black
Streak:Black
Hardness (Mohs):4 - 5
Hardness (Vickers):VHN25=368 kg/mm2
Tenacity:Brittle
Cleavage:None Observed
Density (calculated):5.239 g/cm3

Crystallography of Calvertite

Crystal System:Isometric
Class (H-M):4 3m - Hextetrahedral
Space Group:F4 3m
Cell Parameters:a = 5.3365Å
Unit Cell Volume:V 151.97 ų (Calculated from Unit Cell)
X-Ray Powder Diffraction:
d-spacingIntensity
3.053 (100)
2.639 (10)
1.869 (90)
1.595 (30)

Optical Data of Calvertite

Type:Isotropic
Colour in reflected light:PALE BLUE GRAY
Pleochroism:Non-pleochroic

Chemical Properties of Calvertite

Formula:
Cu
 
5
Ge
 
0.5
S
 
4
Simplified for copy/paste:Cu5Ge0.5S4
Essential elements:Cu, Ge, S
All elements listed in formula:Cu, Ge, S

Relationship of Calvertite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
2.CA.05aCovellite
CuS
2.CA.05bKlockmannite
CuSe
2.CA.05cSpionkopite
Cu
 
39
S
 
28
2.CA.05dYarrowite
Cu
 
9
S
 
8
2.CA.10Nukundamite
Cu
 
3.4
Fe
 
0.6
S
 
4

Other Names for Calvertite

Synonyms:
IMA2006-030
Other Languages:
Simplified Chinese:卡硫锗铜矿

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 Calvertite

Reference List:

- +
Jambor, J.L., Roberts, A.C., Groat, L.A., Stanley, C.J., Criddle, A.J., Feinglos, M.N. (2007): Calvertite, Cu5Ge0.5S4, a new mineral species from Tsumeb, Namibia. Canadian Mineralogist, 45, 1519-1523.

Internet Links for Calvertite

Search Engines:
  • Look for Calvertite on Google
  • Look for Calvertite images on Google
  • External Links:
  • Look for Calvertite on Webmineral
  • Look for Calvertite on Athena Mineralogy
  • Look for Calvertite on Mineralien Atlas
  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Mineral Dealers:
  • Wilensky Fine Minerals
  • Find Calvertite on www.crystalclassics.co.uk
  • SpiriferMinerals.com - high quality low prices
  • Buy rare minerals from Excalibur Minerals
  • Buy minerals from YourMineralCollection
  • Top quality minerals from Kristalle of California
  • Fine Minerals from Weinrich Minerals, Inc.
  • Fabre Minerals - search for Calvertite specimens
  • High-end worldwide specimens & outstanding customer service
  • Rare and Unusual minerals at Mineralogical Research Company
  • Lapis Mineral Magazin
  • rare and unusual minerals mainly crystallized
  • Localities for Calvertite

    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.
    Namibia
     
    • Otjikoto Region (Oshikoto)
      • Tsumeb
    Jambor, J.L., Roberts, A.C., Groat, L.A., Stanley, C.J., Criddle, A.J., Feinglos, M.N. (2007): Calvertite, Cu5Ge0.5S4, a new mineral species from Tsumeb, Namibia. Canadian Mineralogist, 45, 1519-1523
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    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.
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