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Calvertite Mineral Data
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General Calvertite Information
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 Chemical Formula: |
Cu5Ge0.5S4 |
| Composition: |
Molecular Weight = 495.06 gm |
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Vanadium 0.05 % V |
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Zinc 0.54 % Zn |
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Gallium 0.35 % Ga |
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Iron 1.61 % Fe |
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Copper 61.38 % Cu |
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Germanium 5.60 % Ge |
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Arsenic 1.45 % As |
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Sulfur 29.00 % S |
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______ |
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100.00 % |
| Empirical Formula: |
Cu4.78Fe2+0.14Zn0.04Ga0.02V3+0.005Ge0.38As0.09S0.47S4 |
| Environment: |
Occurs in a granular texture formed by a network of chalcocite veins. |
| IMA Status: |
Approved IMA 2006 (Dana # Added) |
| Locality: |
Tsumeb, Namibia Link to MinDat.org Location Data. |
| Name Origin: |
Named for Lauriston (Larry) Derwent Calvert (1924-1993) of the National Research Council, Ottawa, Canada. |
| Synonym: |
IMA2006-030 |
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Calvertite Image |
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Images:
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Calvertite
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 |
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Calvertite Crystallography
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| Cell Dimensions: |
a = 5.337, Z = 1; V = 152.02 Den(Calc)= 5.41 |
| Crystal System: |
Isometric Space Group: F m3m, F 432, or F43m |
| X Ray Diffraction: |
By Intensity(I/Io): 3.053(1), 1.869(0.9), 1.595(0.3),2.639(0.1), |
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Physical Properties of Calvertite
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| Cleavage: |
None |
| Color: |
Black. |
| Diaphaneity: |
Opaque |
| Fracture: |
Conchoidal - Irregular - Irregular fracture producing small, conchoidal fragments. |
| Habit: |
Granular - Generally occurs as anhedral to subhedral crystals in matrix. |
| Hardness: |
4-5 - Fluorite-Apatite |
| Luster: |
Metallic |
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Optical Properties of Calvertite
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| RL Anisotrophism: |
None. |
| RL Bireflectance: |
None. |
| RL Color: |
Pale bluish gray. |
| RL Pleochroism: |
None. |
| Reflectivity |
Standardized Intensity (100%) Reflection Spectra of Calvertite in Air
| λ |
R |
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∑ R(λ) |
| 470 nm |
26.30 |
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| 546 nm |
23.10 |
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| 589 nm |
22.20 |
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| 650 nm |
21.50 |
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Calculated Relative Intensity Colors of Calvertite in Air
Relative
Intensity |
0% |
50% |
100% |
150% |
200% |
250% |
300% |
350% |
400% |
| R |
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Calculated Properties of Calvertite
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| Electron Density: |
Bulk Density (Electron Density)=5.06 gm/cc
note: Specific Gravity of Calvertite =5.41 gm/cc.
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| Fermion Index: |
Fermion Index = 0.0071107878
Boson Index = 0.9928892122 |
| Photoelectric: |
PECalvertite = 34.65 barns/electron
U=PECalvertite x rElectron Density= 175.36 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Calvertite is Not Radioactive |
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Calvertite Classification
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| Dana Class: |
02.05.10.02 (02)Sulfides - Including Selenides and Tellurides |
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(02.05)where Am Bn Xp, with (m+n):p=3:2 |
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(02.05.10)Dana Group |
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02.05.10.01 Putzite! (Cu4.7Ag3.3)GeS6 F43m 4 3m |
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02.05.10.02 Calvertite! Cu5Ge0.5S4 F m3m, F 432, or F43m Cubic |
| Strunz Class: |
02.CA.15 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf |
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02.C - Metal Sulfides, M:S = 1:1 (and similar) |
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02.CA -With Cu |
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02.CA.15 Calvertite! Cu5Ge0.5S4 F m3m, F 432, or F43m Cubic |
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Other Calvertite Information
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| References: |
NAME( AmMin, v93:1686) PHYS. PROP.(AmMin, v93:1686) OPTIC PROP.(AmMin, v93:1686) |
| 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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Print or Cut-and-Paste your Calvertite Specimen Label here :
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Calvertite
Cu5Ge0.5S4
Dana No: 02.05.10.02 Strunz No: 02.CA.15
Locality:
Notes:
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