Coquandite (original) (raw)
A valid IMA mineral species
About CoquanditeHide
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Formula:
Sb6+xO8+x(SO4)(OH)x(H2O)1- x (x = 0.3)
Originally assumed to be (SbO)6(SO4)O2.H2O.
Specific Gravity:
5.78 (Calculated)
Name:
In honour of the French scientist Henri Coquand (1811/13-1881), Professor of geology and mineralogy, who carried out extensive studies of the antimony deposits of Tuscany between 1842 and 1849.
This page provides mineralogical data about Coquandite.
Unique IdentifiersHide
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Long-form identifier:
mindat:1:1:1125:5
f6316d5d-7814-4210-bb6a-42297773c5be
IMA Classification of CoquanditeHide
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IMA Formula:
Sb3+6+xO8+x(SO4)(OH)x(H2O)1-x (x = 0.3)
Type description reference:
Classification of CoquanditeHide
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7.DE.35
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
D : Sulfates (selenates, etc.) with additional anions, with H2O
E : With only medium-sized cations; unclassified
30.1.18.1
30 : ANHYDROUS SULFATES CONTAINING HYDROXYL OR HALOGEN
1 : (AB)m(XO4)pZq, where m:p>2:1
25.8.2
25 : Sulphates
8 : Sulphates of Sb, V, Cr and U
Mineral SymbolsHide
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As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference |
|---|---|---|
| Cqd | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of CoquanditeHide
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Transparency:
Transparent, Translucent
Density:
5.78 g/cm3 (Calculated)
Optical Data of CoquanditeHide
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Comments:
Small size and high RI made optical determinations difficult.
Chemistry of CoquanditeHide
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Mindat Formula:
Sb6+xO8+x(SO4)(OH)x(H2O)1- x (x = 0.3)
Originally assumed to be (SbO)6(SO4)O2.H2O.
Crystallography of CoquanditeHide
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Class (H-M):
1 - Pinacoidal
Cell Parameters:
a = 11.4292(5) Å, b = 29.772(1) Å, c = 11.2989(5) Å
α = 91.152(3)°, β = 119.266(4)°, γ = 92.624(3)°
Ratio:
a:b:c = 0.384 : 1 : 0.38
Unit Cell V:
3,346.44 ų (Calculated from Unit Cell)
Morphology:
Tabular crystals, lamellar, fibers. Elongated along [001] and flattened on {010}.
Twinning:
Polysynthetic twinning with (010) as the twin plane.
Crystal StructureHide
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| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0020507 | Coquandite | Bindi L, Biagioni C, Ceccantini L, Batoni M, Menchetti S (2014) Coquandite, Sb6+xO8+x(SO4)(OH)x*(H2O)1-x (x=0.3), from the Cetine mine, Tuscany, Italy: crystal structure and revision of the chemical formula Mineralogical Magazine 78 871-888 | 2014 | Cetine mine, Tuscany, Italy | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder DiffractionHide
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Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 3.3006 Å | (100) |
| 3.0573 Å | (76) |
| 14.8527 Å | (64) |
| 3.1164 Å | (51) |
| 3.0863 Å | (45) |
| 2.8151 Å | (40) |
| 3.1939 Å | (28) |
| 3.2010 Å | (27) |
| 2.8405 Å | (26) |
| 2.7095 Å | (25) |
Comments:
Data from Bindi et al. (2014).
Geological EnvironmentHide
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Type Occurrence of CoquanditeHide
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General Appearance of Type Material:
Spheroidal knobs of silky fibres or, rarely, as tiny transparent colourless lamellar crystals on stibnite.
Place of Conservation of Type Material:
National Museum of Natural History, (Smithsonian Institution), Washington D.C., USA.
Museums of Natural History of the Universities of Florence and Pisa, Italy (catalogue numbers l761/RI and 8800, respectively).
Geological Setting of Type Material:
Oxidized stibnite deposit
Associated Minerals at Type Locality:
Reference:
Sabelli, C., Orlandi, P., Vezzalini, G. (1992) Coquandite, Sb6O8(SO4)·H2O, a new mineral from Pereta, Tuscany, Italy, and two other localities. Mineralogical Magazine: 56: 599-603.
Synonyms of CoquanditeHide
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Other Language Names for CoquanditeHide
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Common AssociatesHide
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Associated Minerals Based on Photo Data:
Related Minerals - Strunz-mindat GroupingHide
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Fluorescence of CoquanditeHide
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Other InformationHide
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Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for CoquanditeHide
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References for CoquanditeHide
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Reference List:
Bindi, L., Biagioni, C., Ceccantini, L., Batoni, M., Menchetti, S. (2014) Coquandite, Sb6+_x_O8+x(SO4)(OH)x_·(H2O)1–_x (x = 0.3), from the Cetine mine, Tuscany, Italy: crystal structure and revision of the chemical formula. Mineralogical Magazine, 78 (4) 871-888 doi:10.1180/minmag.2014.078.4.08
Localities for CoquanditeHide
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This 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.
Locality ListHide
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