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Coquandite

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Henri Coquand
Formula:
Sb6+xO8+x(SO4)(OH)x(H2O)1- x (x = 0.3)
Originally assumed to be (SbO)6(SO4)O2.H2O.
Colour:
colorless
Lustre:
Adamantine
Hardness:
3 - 4
Specific Gravity:
5.78 (Calculated)
Crystal System:
Triclinic
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.


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Classification of CoquanditeHide

Approved
Approval Year:
1991
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

Physical Properties of CoquanditeHide

Adamantine
Transparency:
Transparent, Translucent
Colour:
colorless
Streak:
white
Hardness:
3 - 4 on Mohs scale
Tenacity:
Flexible
Cleavage:
None Observed
Density:
5.78 g/cm3 (Calculated)

Optical Data of CoquanditeHide

Type:
Biaxial (+)
Dispersion:
r < v strong
Comments:
Small size and high RI made optical determinations difficult.

Chemical Properties of CoquanditeHide

Formula:
Sb6+xO8+x(SO4)(OH)x(H2O)1- x (x = 0.3)

Originally assumed to be (SbO)6(SO4)O2.H2O.
IMA Formula:
Sb3+6+xO8+x(SO4)(OH)x · (H2O)1-x (x = 0.3)

Crystallography of CoquanditeHide

Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
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)
Z:
10
Morphology:
Tabular crystals

Type Occurrence of CoquanditeHide

Place of Conservation of Type Material:
National Museum of Natural History, Smithsonian Institution in Washington, and at Museums of Natural History of the Universities of Florence and Pisa (catalogue numbers l761/RI
and 8800, respectively).
Geological Setting of Type Material:
Oxidized stibnite deposit
Associated Minerals at Type Locality:

Synonyms of CoquanditeHide

Other Language Names for CoquanditeHide

German:Coquandit
Spanish:Coquandita

Common AssociatesHide

Associated Minerals Based on Photo Data:
Stibnite18 photos of Coquandite associated with Stibnite on mindat.org.
Sulphur10 photos of Coquandite associated with Sulphur on mindat.org.
Stibiconite5 photos of Coquandite associated with Stibiconite on mindat.org.
Klebelsbergite4 photos of Coquandite associated with Klebelsbergite on mindat.org.
Quartz3 photos of Coquandite associated with Quartz on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

7.DE.05MangazeiteAl2(SO4)(OH)4 · 3H2OTric.
7.DE.10CarbonatecyanotrichiteCu4Al2(CO3,SO4)(OH)12 · 2H2OOrth.
7.DE.10CyanotrichiteCu4Al2(SO4)(OH)12 · 2H2OOrth.
7.DE.10UKI-1975-(SO:AlCu)(Cu, Al, SO4, H2O)
7.DE.15SchwertmanniteFe3+16(OH,SO4)12-13O16 · 10-12H2OTet.
7.DE.20TlalociteCu10Zn6(Te6+O4)2(Te4+O3)(OH)25Cl · 27H2OOrth.
7.DE.25UtahiteCu5Zn3(TeO4)4(OH)8 · 7H2OTric.
7.DE.40OsakaiteZn4(SO4)(OH)6 · 5H2OTric. 1 : P1
7.DE.45WilcoxiteMgAl(SO4)2F · 17H2OTric. 1 : P1
7.DE.50Stanleyite(V4+O)(SO4) · 6H2OOrth.
7.DE.55McalpineiteCu3(Te6+O6)Iso. m3 (2/m 3) : Ia3
7.DE.60HydrobasaluminiteAl4(SO4)(OH)10 · 12-36H2OMon.
7.DE.62VolaschioiteFe4(SO4)O2(OH)6 · 2H2OMon. 2/m : B2/m
7.DE.65ZaheriteAl12(SO4)5(OH)26 · 20H2OTric.
7.DE.70LautenthalitePbCu4(SO4)2(OH)6 · 3H2OMon. 2/m : P21/b
7.DE.75CamérolaiteCu6Al3(OH)18(H2O)2[Sb(OH)6](SO4)Tric. 1 : P1

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

25.8.1KlebelsbergiteSb4O4(SO4)(OH)2Orth. mm2
25.8.3PeretaiteCa(SbO)4(SO4)2(OH)2 · 2H2OMon. 2/m : B2/b
25.8.4CannoniteBi2(SO4)O(OH)2Mon. 2/m : P21/b
25.8.5Minasragrite(V4+O)(SO4) · 5H2OMon. 2/m
25.8.6Stanleyite(V4+O)(SO4) · 6H2OOrth.
25.8.7Redingtonite(Fe2+,Mg,Ni)(Cr,Al)2(SO4)4·22H2OMon.
25.8.8Metauranopilite(UO2)6(SO4)(OH)10 · 5H2O
25.8.9Uranopilite(UO2)6(SO4)O2(OH)6 · 14H2OMon.
25.8.10NatrozippeiteNa5(UO2)8(SO4)4O5(OH)3 · 12H2OMon. 2/m : P21/m
25.8.11ZippeiteK3(UO2)4(SO4)2O3(OH) · 3H2OMon. 2 : B2
25.8.12JohanniteCu(UO2)2(SO4)2(OH)2 · 8H2OTric. 1
25.8.13MagnesiozippeiteMg(UO2)2(SO4)O2 · 3.5H2OMon. 2/m : B2/m
25.8.14ZinczippeiteZn(UO2)2(SO4)O2 · 3.5H2OMon. 2/m : B2/m

Fluorescence of CoquanditeHide

None observed

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for CoquanditeHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
New Minerals (1997), New Minerals 1990-1994.
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
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.

Internet Links for CoquanditeHide

Localities for CoquanditeHide

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

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Italy (TL)
 
  • Tuscany
    • Grosseto Province
      • Scansano
        • Pereta
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
    • Pisa Province
      • Pomarance
Orlandi, P. (1997): Zibaldone di mineralogia italiana. Rivista Mineralogica Italiana, 21, 179-185. ; Bardi, T., Biagioni, C., & Orlandi, P. (2009). Aggiornamento sui minerali della Sorgente Solfurea di Micciano (Pomarance, Pisa, Toscana). MICRO (località), 1/2009, 261-276.
    • Siena Province
      • Chiusdino
Lapis Magazine Vol 6.1993 Page 22; Menchetti, S., Batoni, M., Batacchi, C., Borselli, G., Brogi, A., Ceccantini, L., Fassina, B., Marchesini, M., Rossellini, A. & Ruggieri, G. (2015): Le Cetine di Cotorniano. Miniera e minerali. Associazione Micro-Mineralogica Italiana, Cremona, 354 p.
Japan
 
  • Shikoku Island
    • Ehime Prefecture
      • Saijo City
specimens seen at Kyoto show, 2010
Luxembourg
 
  • Diekirch District
    • Wiltz
      • Goesdorf commune
        • Goesdorf
Simon Philippo analysis (to be published); [Filella M., Philippo S., Belzile N., Chen Y. and Quentel F. (2009) Natural attenuation processes applying to antimony: A study in the abandoned antimony mine in Goesdorf, Luxembourg - Science of the total environment (in press)]
Portugal
 
  • Porto District
    • Gondomar
      • Medas
Roper, A. J., Leverett, P., Murphy, T. D., Williams, P. A., & Hibbs, D. E. (2015). Klebelsbergite, Sb4O4SO4 (OH) 2: Stability relationships, formation in Nature, and refinement of its structure. American Mineralogist, 100(2-3), 602-607.
Romania
 
  • Maramureș Co.
Gabor Koller specimens
collected: Gábor Koller, analysed: Sándor Szakáll, Béla Fehér EDS, and PXRD
Gábor Koller collection (EDS- and PXRD-analysed by Sándor Szakáll and Béla Fehér)
USA (TL)
 
  • Washington
    • Okanogan Co.
      • Tonasket
        • Whitestone Coulee
Mineralogical Magazine: 56:599-603.
Mineral and/or Locality  
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