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Coquandite Mineral Data
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General Coquandite Information
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 Chemical Formula: |
Sb6O8(SO4)•(H2O) |
| Composition: |
Molecular Weight = 972.57 gm |
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Antimony 75.11 % Sb 89.92 % Sb2O3 |
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Hydrogen 0.21 % H 1.85 % H2O |
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Sulfur 3.30 % S 8.23 % SO3 |
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Oxygen 21.39 % O |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
| Empirical Formula: |
Sb6O8(SO4)•(H2O) |
| Environment: |
Probably produced by action of H2SO4 on stibnite, in a stibnite vein in silicified limestone |
| IMA Status: |
Approved IMA 1992 |
| Locality: |
Cetine mine, 20 km southwest of Siena, and the Pereta mine, Scansano, Tuscany, Italy. Link to MinDat.org Location Data. |
| Name Origin: |
Named for Henri-Jean-Baptiste Coquand (1813-1881), Professor of Geology and Mineralogy, University of Marseilles, Marseilles, France |
| Synonym: |
IMA1991-024 |
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Coquandite Image |
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Images:
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Coquandite Crystallography
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| Axial Ratios: |
a:b:c =0.384:1:0.38 |
| Cell Dimensions: |
a = 11.434, b = 29.77, c = 11.314, Z = 12; alpha = 91.073°, beta = 119.245°, gamma = 92.82° V = 3,355.64 Den(Calc)= 5.77 |
| Crystal System: |
Triclinic - Pinacoidal H-M Symbol ( 1) Space Group: P1 |
| X Ray Diffraction: |
By Intensity(I/Io): 3.092(1), 3.304(0.93), 6.81(0.67), |
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Physical Properties of Coquandite
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| Cleavage: |
{???} Perfect |
| Color: |
Colorless, White. |
| Diaphaneity: |
Transparent to Translucent |
| Hardness: |
3-4 - Calcite-Fluorite |
| Luster: |
Adamantine |
| Streak: |
white |
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Optical Properties of Coquandite
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| Gladstone-Dale: |
CI calc= 0.081 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1869,KC= 0.2034
Ncalc = 2.18 |
| Optical Data: |
Biaxial (+), b=2.08, 2V(Meas)=80-85. |
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Calculated Properties of Coquandite
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| Electron Density: |
Bulk Density (Electron Density)=5.09 gm/cc
note: Specific Gravity of Coquandite =5.78 gm/cc.
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| Fermion Index: |
Fermion Index = 0.0003502393
Boson Index = 0.9996497607 |
| Photoelectric: |
PECoquandite = 251.19 barns/electron
U=PECoquandite x rElectron Density=1,277.87 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Coquandite is Not Radioactive |
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Coquandite Classification
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| Dana Class: |
30.01.18.01 (30)Anhydrous Sulfates Containing Hydroxyl or Halogen |
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(30.01)where (A B)m (XO4)p Zq where m:p>2:1 |
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(30.01.18)Dana Group |
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30.01.18.01 Coquandite Sb6O8(SO4)•(H2O) P1 1 |
| Strunz Class: |
07.DE.35 07 - SULFATES (SELENATES, TELLURATES) |
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07.D - Sulfates (selenates, etc.) with additional anions, with H2O |
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07.DE -With only medium-sized cations; unclassified |
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07.DE.35 Coquandite Sb6O8(SO4)•(H2O) P1 1 |
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Other Coquandite Information
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| References: |
NAME( AntBidBlaNic5) PHYS. PROP.(37th List of New Min.,Min. Mag.,1996) OPTIC PROP.(37th List of New Min.,Min. Mag.,19) |
| See Also: |
Links to other databases for Coquandite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
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Print or Cut-and-Paste your Coquandite Specimen Label here :
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Coquandite
Sb6O8(SO4)•(H2O)
Dana No: 30.01.18.01 Strunz No: 07.DE.35
Locality:
Notes:
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