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Obradovicite-NaNa

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Formula:
[Na2(H2O)16Na(H2O)6][Mo8As2Fe3+3O33(OH)4]
Colour:
Yellowish green
Lustre:
Sub-Adamantine, Vitreous
Hardness:
2
Crystal System:
Orthorhombic
Name:
First described by Kampf et al (2012) from 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.
First recognized as a potential hypothetical member of the Betpakdalite group (IMA 10-E). Later in 2011, approved by IMA as a valid species.


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Classification of Obradovicite-NaNaHide

Approved
Approval Year:
2011

Physical Properties of Obradovicite-NaNaHide

Sub-Adamantine, Vitreous
Transparency:
Transparent
Colour:
Yellowish green
Streak:
Very pale yellowish green
Hardness:
Tenacity:
Brittle
Cleavage:
None Observed
Fracture:
Splintery

Optical Data of Obradovicite-NaNaHide

Type:
Biaxial (+)
RI values:
nα = 1.768(3) nβ = 1.776(3) nγ = 1.787(3)
2V:
Measured: 82° (2), Calculated: 81.4°
Max Birefringence:
δ = 0.019
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Very High
Dispersion:
r > v, strong
Pleochroism:
Non-pleochroic

Chemical Properties of Obradovicite-NaNaHide

Formula:
[Na2(H2O)16Na(H2O)6][Mo8As2Fe3+3O33(OH)4]
IMA Formula:
[Na2(H2O)16Na(H2O)6][Mo6+8As2Fe3+3O33(OH)4]

Crystallography of Obradovicite-NaNaHide

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
Unit Cell V:
2485.2 ų
Z:
2
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 paralllel to [010]. Often double terminated.
Comment:
Space group: Pnmb

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
10.641(43)
8.954(100)
7.487(21)
3.716(15)
2.987(18)
2.906(29)
2.602(16)

Type Occurrence of Obradovicite-NaNaHide

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:

Synonyms of Obradovicite-NaNaHide

Other Language Names for Obradovicite-NaNaHide

Relationship of Obradovicite-NaNa to other SpeciesHide

Other Members of this group:
Obradovicite-KCu[K2(H2O)17Cu(H2O)6][Mo8As2Fe3+3O34(OH)3]Orth. mmm (2/m 2/m 2/m) : Pmna
Obradovicite-NaCuNa2(H2O)17Cu(H2O)6][Mo8As2Fe3+3O34(OH)3] Orth. mmm (2/m 2/m 2/m) : Pmna

Fluorescence of Obradovicite-NaNaHide

Other InformationHide

Notes:
Slowly soluble in dil. 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.

References for Obradovicite-NaNaHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Kampf, A.R., Mills, S.J., Birch, W.D. and Dini, M. (2011) Obradovicite-NaNa, IMA 2011-046. CNMNC Newsletter No. 10,October 2011, page 2559
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.

Internet Links for Obradovicite-NaNaHide

Localities for Obradovicite-NaNaHide

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.
Chile (TL)
 
  • Antofagasta Region
    • El Loa Province
      • Calama
        • Chuquicamata District
Kampf, A.R., Mills, S.J., Birch, W.D. and Dini, M. (2011) Obradovicite-NaNa, IMA 2011-046. CNMNC Newsletter No. 10,October 2011, page 2559
Mineral and/or Locality  
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