Obradovicite-NaNa (original) (raw)

A valid IMA mineral species

About Obradovicite-NaNaHide

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Formula:

[Na2(H2O)16Na(H2O)6][Mo8As2Fe3+3O33(OH)4]

Lustre:

Sub-Adamantine, Vitreous

Crystal System:

Orthorhombic

Name:

Named for its relationship to other obradovicite group species. The double suffix corresponds to the dominant cations in two different types of non-framework cation sites; in this case both sites are dominated by sodium.

First recognized as a potential hypothetical member of the betpakdalite group (IMA 10-E). Later found on specimens in the collections of the Natural History Museum of Los Angeles County, USA, on samples collected earlier from the dumps of the Chuquicamata Mine, Chile by Ramn Tabilo, a former mine engineer and approved by IMA as a valid species in 2011. Described by Kampf et al. (2012).

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:41949:9

2ae6bfc4-5bc4-4d31-b4bc-58377956f2c6

IMA Classification of Obradovicite-NaNaHide

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IMA Formula:

[Na2(H2O)16Na(H2O)6][Mo8As2Fe3+3O33(OH)4]

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-NaNaHide

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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.

Physical Properties of Obradovicite-NaNaHide

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Streak:

Very pale yellowish green

Optical Data of Obradovicite-NaNaHide

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RI values:

_n_α = 1.768(3) _n_β = 1.776(3) _n_γ = 1.787(3)

2V:

Measured: 82° (2), Calculated: 81.4°

δ = 0.019

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

Pleochroism:

Non-pleochroic

Chemistry of Obradovicite-NaNaHide

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Mindat Formula:

[Na2(H2O)16Na(H2O)6][Mo8As2Fe3+3O33(OH)4]

Crystallography of Obradovicite-NaNaHide

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Crystal System:

Orthorhombic

Cell Parameters:

a = 14.8866(11) Å, b = 11.0880(2) Å, c = 15.0560(3) Å

Ratio:

a:b:c = 1.343 : 1 : 1.358

Morphology:

Short bladed crystals, flattened on {001}, elongated parallel to [010]. Size: Up to 0.15 mm in length. Forms observed: {001}, {110} and {101}. The {001} are showing striations parallel to [010]. Often double terminated.

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-NaNaHide

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General Appearance of Type Material:

As crystalline coating on massive quartz-muscovite rock.

Place of Conservation of Type Material:

Natural History Museum of Los Angeles County, catalogue numbers 63313 and 63314.

Geological Setting of Type Material:

From the oxidation zone of copper porphyry 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-NaNaHide

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Relationship of Obradovicite-NaNa to other SpeciesHide

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Other Members of this group:

Common AssociatesHide

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Associated Minerals Based on Photo Data:

Related Minerals - Strunz-mindat GroupingHide

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Fluorescence of Obradovicite-NaNaHide

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Other InformationHide

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Notes:

Slowly soluble in dilute acids.

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-NaNaHide

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References for Obradovicite-NaNaHide

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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-NaNaHide

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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.