Obradovicite-NaCu (original) (raw)

A valid IMA mineral species

Formula:

Na2(H2O)17Cu(H2O)6][Mo8As2Fe3+3O34(OH)3]

Lustre:

Sub-Adamantine, Vitreous

Crystal System:

Orthorhombic

Name:

Named for its relationship to other obradovicite group minerals. The double suffix corresponds to the dominant cations in two different types of non-framework cation sites; in this case sodium and copper.

First recognized as a potential hypothetical member of the Betpakdalite group (IMA 10-E). Later in 2011, approved by IMA as a valid species. Found on the type specimen of obradovicite-KCu (formerly obradovicite) from the Chuquicamata mine, Chile.

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:41948:0

07df2ac6-0673-4299-b8c5-3b5cb6a8f900

IMA Classification of Obradovicite-NaCuHide

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IMA Formula:

[Na2(H2O)17Cu(H2O)6][Mo8As2Fe3+3O34(OH)3]

Type description reference:

Kampf, A. R., Mills, S. J., Rumsey, M. S., Dini, M., Birch, W. D., Spratt, J., Pluth, J. J., Steele, I. M., Jenkins, R. A., Pinch, W. W. (2012) The heteropolymolybdate family: structural relations, nomenclature scheme and new species. Mineralogical Magazine, 76 (5) 1175-1207 doi:10.1180/minmag.2012.076.5.09

Classification of Obradovicite-NaCuHide

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7.GB.45

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

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.

Pronunciation of Obradovicite-NaCuHide

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Pronunciation:

Physical Properties of Obradovicite-NaCuHide

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Streak:

Very pale yellowish green

Optical Data of Obradovicite-NaCuHide

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RI values:

_n_α = 1.790(3) _n_β = 1.798(3) _n_γ = 1.805

δ = 0.015

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

Pleochroism:

Non-pleochroic

Chemistry of Obradovicite-NaCuHide

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Mindat Formula:

Na2(H2O)17Cu(H2O)6][Mo8As2Fe3+3O34(OH)3]

Crystallography of Obradovicite-NaCuHide

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Crystal System:

Orthorhombic

Class (H-M):

m m m _(_2/_m_2/_m_2/m ) - Dipyramidal

Cell Parameters:

a = 14.872(4) Å, b = 11.091(3) Å, c = 15.032(4) Å

Ratio:

a:b:c = 1.341 : 1 : 1.355

Morphology:

Short bladed crystals, flattened on {001}, elongated parallel to [010]. Size: Up to ~0.1 mm in length. Forms observed: {001}, {110} and {101}. The {001} are showing striations paralllel to [010]. Often double terminated.

Twinning:

No twinning observed.

Comment:

Space group: Pnmb

X-Ray Powder DiffractionHide

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Powder Diffraction Data:

Geological EnvironmentHide

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Type Occurrence of Obradovicite-NaCuHide

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General Appearance of Type Material:

Sugary aggregates intermixed with fragmented quartz crystals embedded in a porous boxwork of hematite and goethite.

Place of Conservation of Type Material:

Colorado School of Mines Geology Museum, Golden, Colorado, USA, catalogue number 86.496.

Geological Setting of Type Material:

Oxidation zone of porphyry copper deposit.

Associated Minerals at Type Locality:

Reference:

Kampf, A.R., Mills, S.J., Rumsey, M.S., Dini, M., Birch, W.D., Spratt, J., Pluth, J.J., Steele, I.M., Jenkins, R.A., Pinch, W.W. (2012): The heteropolymolybdate family: structural relations, nomenclature scheme and new species. Mineralogical Magazine, 76, 1175-1207.

Synonyms of Obradovicite-NaCuHide

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Relationship of Obradovicite-NaCu to other SpeciesHide

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Other Members of this group:

Related Minerals - Strunz-mindat GroupingHide

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Fluorescence of Obradovicite-NaCuHide

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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 Obradovicite-NaCuHide

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References for Obradovicite-NaCuHide

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Reference List:

Kampf, A. R., Mills, S. J., Rumsey, M. S., Dini, M., Birch, W. D., Spratt, J., Pluth, J. J., Steele, I. M., Jenkins, R. A., Pinch, W. W. (2012) The heteropolymolybdate family: structural relations, nomenclature scheme and new species. Mineralogical Magazine, 76 (5) 1175-1207 doi:10.1180/minmag.2012.076.5.09

Localities for Obradovicite-NaCuHide

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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.