Obradovicite-KCu (original) (raw)

A valid IMA mineral species

About Obradovicite-KCuHide

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Formula:

[K2(H2O)17Cu(H2O)6][Mo8As2Fe3+3O34(OH)3]

Colour:

Pea-green (RHS 149A)

Lustre:

Sub-Adamantine, Vitreous

Crystal System:

Orthorhombic

Name:

Named obradovicite by Finney et al. (1986) in honor of Martin T. Obradovic, from whose mineral collection the type material came. He graduated from Colorado School of mines in 1953. In 1970 he headed the alumni association in Lima, Peru. The double suffix was added in 2010 by the International Mineralogical Association in a redefinition of this and related species. The double suffix corresponds to the dominant cations in two different types of non-framework cation sites; in this case potassium and copper.

Formerly called obradovicite; redefined in 2010 (IMA 10-E). Both obradovicite-NaCu and obradovicite-KCu was found on the type specimen of "obradovicite".

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:2952:6

93fe95f6-7f58-4aa9-bc3f-35947e87f58e

IMA Classification of Obradovicite-KCuHide

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IMA status notes:

Renamed by the IMA

Approval history:

Renamed from obradovicite to obradovicite-KCu in IMA Proposal 10-E (CNMNC Newsletter 7)

Type description reference:

Classification of Obradovicite-KCuHide

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7.GB.40

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

49.4.2.1

49 : HYDRATED MOLYBDATES AND TUNGSTATES
4 : Compound Molybdates and Tungstates

22.5.10

22 : Phosphates, Arsenates or Vanadates with other Anions
5 : Phosphates, arsenates or vanadates with chromate, molybdate, niobate or tantalate

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 Obradovicite-KCuHide

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Colour:

Pea-green (RHS 149A)

Streak:

Pale pea-green (RHS 149C)

Density:

3.55 g/cm3 (Measured) 3.68 g/cm3 (Calculated)

Optical Data of Obradovicite-KCuHide

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RI values:

_n_α = 1.790 _n_β = 1.798 _n_γ = 1.811

2V:

Measured: 81° , Calculated: 75.7°

δ = 0.021

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

Comments:

Weak yellow pleochroism, Z > X = Y

Chemistry of Obradovicite-KCuHide

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Mindat Formula:

[K2(H2O)17Cu(H2O)6][Mo8As2Fe3+3O34(OH)3]

Crystallography of Obradovicite-KCuHide

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Crystal System:

Orthorhombic

Class (H-M):

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

Cell Parameters:

a = 15.046 Å, b = 14.848 Å, c = 11.056 Å

Ratio:

a:b:c = 1.013 : 1 : 0.745

Unit Cell V:

2,469.94 ų (Calculated from Unit Cell)

Morphology:

a{100}, m {110}, and d{011}

X-Ray Powder DiffractionHide

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Powder Diffraction Data:

Geological EnvironmentHide

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Type Occurrence of Obradovicite-KCuHide

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General Appearance of Type Material:

dense clusters of platy crystals to 0.1 mm

Place of Conservation of Type Material:

Colorado School of Mines Museum, and National Museum of Natural History, Smithsonian Institution, Washington, DC, USA

Geological Setting of Type Material:

on brecciated, slightly leached, vein quartz or on crusts of earthy tan jarosite

Associated Minerals at Type Locality:

Reference:

Finney, J.J., Williams, S.A., Hamilton, R.D. (1986) Obradovicite, a new complex arsenate-molybdate from Chuquicamata, Chile. Mineralogical Magazine: 50: 283-284.

Synonyms of Obradovicite-KCuHide

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Other Language Names for Obradovicite-KCuHide

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Relationship of Obradovicite-KCu to other SpeciesHide

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Other Members of this group:

Related Minerals - Strunz-mindat GroupingHide

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Fluorescence of Obradovicite-KCuHide

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does not fluoresce under SW

Other InformationHide

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Notes:

It is insoluble in cold 1:1 HNO3 but dissolves rapidly upon heating, readily soluble in cold 1:1 HCl, rapidly turns dull brick orange in 40% KOH, and is unaffected by 20% NH4OH.

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-KCuHide

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References for Obradovicite-KCuHide

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Reference List:

Hawthorne, Frank C., Jambor, John L., Bladh, Kenneth W., Burke, Ernst A. J., Grice, Joel D., Phillips, Don, Roberts, Andrew C., Schedler, Robert A., E., James (1987) New mineral names. American Mineralogist, 72 (9-10) 1023-1028

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-KCuHide

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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.