Cuprotungstite (original) (raw)

A valid IMA mineral species - grandfathered

About CuprotungstiteHide

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Colour:

Emerald green, brown, olive-green, pistachio-green

Lustre:

Vitreous, Waxy, Earthy

Specific Gravity:

5.4 - 6.98

Crystal System:

Tetragonal

Name:

In allusion to the composition, containing copper (Latin = CUPRum) and TUNGSTen.

A rare secondary mineral commonly occurring as the result of scheelite altering in a copper-rich environment.

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:1194:1

58fa9f14-91cf-49bd-a981-efaf25174efa

IMA Classification of CuprotungstiteHide

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Approved, 'Grandfathered' (first described prior to 1959)

IMA Formula:

Cu2+3(WO4)2(OH)2

Classification of CuprotungstiteHide

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7.GB.15

7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
G : Molybdates, Wolframates and Niobates
B : With additional anions and/or H2O

48.3.2.1

48 : ANHYDROUS MOLYBDATES AND TUNGSTATES
3 : Basic Anhydrous Molybdates and Tungstates

27.4.1

27 : Sulphites, Chromates, Molybdates and Tungstates
4 : Tungstates

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.

Physical Properties of CuprotungstiteHide

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Colour:

Emerald green, brown, olive-green, pistachio-green

Streak:

Greenish gray to greenish yellow

Density:

5.4 - 6.98 g/cm3 (Measured) 7.06 g/cm3 (Calculated)

Optical Data of CuprotungstiteHide

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RI values:

_n_ω = 2.180 _n_ε = 2.100

δ = 0.080

Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.

Chemistry of CuprotungstiteHide

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Mindat Formula:

Cu2(WO4)(OH)2

Crystallography of CuprotungstiteHide

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Crystal System:

Tetragonal

Class (H-M):

422 - Trapezohedral

Cell Parameters:

a = 8.93 Å, c = 14.48 Å

Unit Cell V:

1,154.71 ų (Calculated from Unit Cell)

Morphology:

Crystals minute, dipyramidal; forms microcrystalline aggregates of botryoidal globules, incrustations, and veinlets; also compact to friable massive.

X-Ray Powder DiffractionHide

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Powder Diffraction Data:

Comments:

Cave Creek, Arizona, USA. Data from Walenta (1979).

Geological EnvironmentHide

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Type Occurrence of CuprotungstiteHide

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Place of Conservation of Type Material:

Natural History Museum, Paris, France: #69.47.

Synonyms of CuprotungstiteHide

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Other Language Names for CuprotungstiteHide

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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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Other InformationHide

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Notes:

Readily soluble in acids.

Forms more or less complete pseudomorphs after scheelite.

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 CuprotungstiteHide

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References for CuprotungstiteHide

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Reference List:

**Palache, Charles, Berman, Harry, Frondel, Clifford (1951) The System of Mineralogy (7th ed.) Vol. 2 - Halides, Nitrates, Borates, Carbonates, Sulfates, Phosphates, Arsenates, Tungstates, Molybdates, Ect. John Wiley and Sons, New York.**pp.1091-1092

Localities for CuprotungstiteHide

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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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- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and 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 (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.