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Betpakdalite-NaNa

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Formula:
[Na2(H2O)16Na(H2O)6][Mo8As2Fe3+3O33(OH)4]
Colour:
Yellow
Lustre:
Sub-Adamantine, Vitreous
Hardness:
3
Specific Gravity:
2.87
Crystal System:
Monoclinic
Name:
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 Betpakdalite-NaNaHide

Approved
Approval Year:
2011
8.BM.

8 : PHOSPHATES, ARSENATES, VANADATES
B : Phosphates, etc., with additional anions, without H2O
M : With medium-sized and large cations, (OH, etc.):RO4 = 4:1

Physical Properties of Betpakdalite-NaNaHide

Sub-Adamantine, Vitreous
Transparency:
Transparent
Colour:
Yellow
Streak:
Colorless to very pale yellow
Hardness:
Tenacity:
Brittle
Cleavage:
Perfect
{001}
Fracture:
Splintery
Density:
2.87(3) g/cm3 (Measured)    2.877 g/cm3 (Calculated)

Optical Data of Betpakdalite-NaNaHide

Type:
Biaxial (+)
RI values:
nα = 1.765(5) nβ = 1.785(5) nγ = 1.850
2V:
Measured: 60° (5)
Max Birefringence:
δ = 0.085
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Very High
Dispersion:
r > v moderate
Pleochroism:
Non-pleochroic

Chemical Properties of Betpakdalite-NaNaHide

Formula:
[Na2(H2O)16Na(H2O)6][Mo8As2Fe3+3O33(OH)4]
IMA Formula:
[Na2(H2O)16Na(H2O)6][Mo6+8As5+2Fe3+3O33(OH)4]

Crystallography of Betpakdalite-NaNaHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/m
Cell Parameters:
a = 19.2370(12) Å, b = 11.0945(7) Å, c = 15.1459(9) Å
β = 130.342(1)°
Ratio:
a:b:c = 1.734 : 1 : 1.365
Unit Cell V:
2463.8 ų
Morphology:
Striated prismatic to bladed crystals, flattened on {001} and elongated prallel to [010] (Up to 0.4mm in length and 0.1 mm in diameter). Forms observed: {001}, {110},{10-1} and {20-1}.
Twinning:
Multipel, complex penetrations twins.

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
11.586(27)
9.640(30)
8.930(100)
7.389(33)
3.697(25)
3.168(25)
2.980(24)
2.862(27)

Type Occurrence of Betpakdalite-NaNaHide

General Appearance of Type Material:
Matrix: brecciated vein quartz intermixed with, cemented by or coated by jarosite and oxyhydroxides.
Place of Conservation of Type Material:
Natural History Museum of Los Angeles County, Los Angeles, California, USA, catalogue numbers 63570 and 63571
Geological Setting of Type Material:
Upper oxidation zone of the Chiquicamata Mine, Chile, a porphyry copper deposit
Associated Minerals at Type Locality:

Synonyms of Betpakdalite-NaNaHide

Relationship of Betpakdalite-NaNa to other SpeciesHide

Other Members of this group:
Betpakdalite-CaCa[Ca2(H2O)17Ca(H2O)6][Mo6+8As5+2Fe3+3O36(OH)]Mon. 2/m : B2/m
Betpakdalite-CaMg[Ca2(H2O)17Mg(H2O)6][Mo8As2Fe3+3O36(OH)] Mon. 2/m : B2/m
Betpakdalite-FeFe[Fe3+2 (H2O)15(OH)2Fe3+(H2O)6][Mo8As2Fe3+3 O37]Mon. 2/m : B2/m
Betpakdalite-NaCa[Na2(H2O)17Ca(H2O)6][Mo6+8As5+2Fe3+3O34(OH)3]Mon. 2/m : B2/m

Related Minerals - Nickel-Strunz GroupingHide

8.BM.05Retzian-(Ce)Mn2+2Ce(AsO4)(OH)4Orth. mmm (2/m 2/m 2/m) : Pban
8.BM.05Retzian-(La)(Mn2+,Mg)2(La,Ce,Nd)(AsO4)(OH)4Orth. mmm (2/m 2/m 2/m) : Pban
8.BM.05Retzian-(Nd)Mn2+2(Nd,Ce,La)(AsO4)(OH)4Orth. mmm (2/m 2/m 2/m) : Pban
8.BM.10Paulkellerite(BiO)2Fe3+(PO4)(OH)2Mon. 2/m : B2/b
8.BM.10KolitschitePbZn0.5Fe3(AsO4)2(OH)6Mon. 2/m : B2/b
8.BM.15Brendelite(Bi3+,Pb)2(Fe3+,Fe2+)(PO4)O2(OH)Mon. 2/m : B2/m

Fluorescence of Betpakdalite-NaNaHide

Other InformationHide

Notes:
Slowly soluble in concentrated HCl
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 Betpakdalite-NaNaHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Kampf, A.R., Mills, S.J. (2011) Betpakdalite-NaNa, IMA 2011-078. CNMNC Newsletter No. 11, December 2011, page 2892. Mineralogical Magazine: 75: 2887-2893.
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 Betpakdalite-NaNaHide

Localities for Betpakdalite-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. and Mills, S.J. (2011): Betpakdalite-NaNa, IMA 2011-078. CNMNC Newsletter No. 11, December 2011, page 2892; Mineralogical Magazine, 75, 2887-2893; 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.
Mineral and/or Locality  
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