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Obradovicite-NaNa

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Formula:
[Na2(H2O)16Na(H2O)6][Mo8As2Fe33+O33(OH)4]
System:
Orthorhombic
Colour:
Yellowish green
Hardness:
2
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.


Classification of Obradovicite-NaNa

Approved
Approval Year:
2011

Type Occurrence of Obradovicite-NaNa

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:

Physical Properties of Obradovicite-NaNa

Sub-Adamantine, Vitreous
Diaphaneity (Transparency):
Transparent
Colour:
Yellowish green
Streak:
Very pale yellowish green
Hardness (Mohs):
2
Tenacity:
Brittle
Cleavage:
None Observed
Fracture:
Splintery

Crystallography of Obradovicite-NaNa

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 Volume:
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 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)

Optical Data of Obradovicite-NaNa

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-NaNa

Formula:
[Na2(H2O)16Na(H2O)6][Mo8As2Fe33+O33(OH)4]
All elements listed in formula:
Analytical Data:
Empirical formula based on Mo = 8
Empirical Formula:
[(Na2.20K1.603.80(H2O)14.20(Na0.85Cu2+0.11Ca0.03Zn0.11.00(H2O)6][ Mo8(As1.81P0.051.86Fe3+2.97O34.16(OH)2.84]

Relationship of Obradovicite-NaNa to other Species

Other Members of Group:
Obradovicite-KCu[K2(H2O)17Cu(H2O)6][Mo8As2Fe33+O34(OH)3]
Obradovicite-NaCuNa2(H2O)17Cu(H2O)6][Mo8As2Fe33+O34(OH)3]

Other Names for Obradovicite-NaNa

Name in Other Languages:

Other Information

Other Information:
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-NaNa

Reference List:
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-NaNa

mindat.org URL:
http://www.mindat.org/min-41949.html
Please feel free to link to this page.

Localities for Obradovicite-NaNa

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
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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