Mineralogy Database

Calvertite Mineral Data

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General Calvertite Information

Help on Chemical  Formula: Chemical Formula: Cu5Ge0.5S4
Help on Composition: Composition: Molecular Weight = 495.06 gm
   Vanadium    0.05 %  V
   Zinc        0.54 %  Zn
   Gallium     0.35 %  Ga
   Iron        1.61 %  Fe
   Copper     61.38 %  Cu
   Germanium   5.60 %  Ge
   Arsenic     1.45 %  As
   Sulfur     29.00 %  S
             100.00 % 
Help on Empirical Formula: Empirical Formula: Cu4.78Fe2+0.14Zn0.04Ga0.02V3+0.005Ge0.38As0.09S0.47S4
Help on Environment: Environment: Occurs in a granular texture formed by a network of chalcocite veins.
Help on IMA Status: IMA Status: Approved IMA 2006 (Dana # Added)
Help on Locality: Locality: Tsumeb, Namibia Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Lauriston (Larry) Derwent Calvert (1924-1993) of the National Research Council, Ottawa, Canada.
Help on Synonym: Synonym: IMA2006-030

Calvertite Image

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Comments: SEM images of massive-granular calvertite. The texture is made apparent by the presence of a thin rind of chalcocite (white) on the calvertite grains. (CanMin, v45:1519).
Location: Partly oxidized specimen from the Tsumeb mine, Tsumeb, Namibia. Scale: See Image.
© Canadian Mineralogist

Calvertite Crystallography

Help on Cell Dimensions: Cell Dimensions: a = 5.337, Z = 1; V = 152.02 Den(Calc)= 5.41
Help on Crystal System: Crystal System: Isometric Space Group: F m3m, F 432, or F43m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.053(1), 1.869(0.9), 1.595(0.3),2.639(0.1),

Physical Properties of Calvertite

Help on Cleavage: Cleavage: None
Help on Color: Color: Black.
Help on Diaphaneity: Diaphaneity: Opaque
Help on Fracture: Fracture: Conchoidal - Irregular - Irregular fracture producing small, conchoidal fragments.
Help on Habit: Habit: Granular - Generally occurs as anhedral to subhedral crystals in matrix.
Help on Hardness: Hardness: 4-5 - Fluorite-Apatite
Help on Luster: Luster: Metallic

Optical Properties of Calvertite

Help on RL Anisotrophism: RL Anisotrophism: None.
Help on RL Bireflectance: RL Bireflectance: None.
Help on RL Color: RL Color: Pale bluish gray.
Help on RL Pleochroism: RL Pleochroism: None.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Calvertite in Air
λ R  ∑ R(λ) 
 470 nm   26.30   
 546 nm   23.10 
 589 nm   22.20 
 650 nm   21.50 
Calculated Relative Intensity Colors of Calvertite in Air
   0%   50% 100% 150% 200% 250% 300% 350% 400%

Calculated Properties of Calvertite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=5.06 gm/cc
note: Specific Gravity of Calvertite =5.41 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0071107878
Boson Index = 0.9928892122
Help on Photoelectric: Photoelectric: PECalvertite = 34.65 barns/electron
U=PECalvertite x rElectron Density= 175.36 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Calvertite is Not Radioactive

Calvertite Classification

Help on  Dana Class: Dana Class: (02)Sulfides - Including Selenides and Tellurides
  (02.05)where Am Bn Xp, with (m+n):p=3:2
  (02.05.10)Dana Group Putzite! (Cu4.7Ag3.3)GeS6 F43m 4 3m Calvertite! Cu5Ge0.5S4 F m3m, F 432, or F43m Cubic
Help on  Strunz Class: Strunz Class: 02.CA.15 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf
  02.C - Metal Sulfides, M:S = 1:1 (and similar)
  02.CA -With Cu
02.CA.15 Calvertite! Cu5Ge0.5S4 F m3m, F 432, or F43m Cubic

Other Calvertite Information

Help on References: References: NAME( AmMin, v93:1686) PHYS. PROP.(AmMin, v93:1686) OPTIC PROP.(AmMin, v93:1686)
Help on See Also: See Also: Links to other databases for Calvertite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Dana No: Strunz No: 02.CA.15





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