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Betpakdalite-NaNa

A valid IMA mineral species
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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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Unique IdentifiersHide

Mindat ID:
41945
Long-form identifier:
mindat:1:1:41945:3
GUID
(UUID V4):
6137eeb5-9fee-4df5-abf2-0f032a98d14d

IMA Classification of Betpakdalite-NaNaHide

IMA status:
Approved
IMA Formula:
[Na2(H2O)16Na(H2O)6][Mo6+8As5+2Fe3+3O33(OH)4]
Approval year:
2011

Classification of Betpakdalite-NaNaHide

Strunz-mindat (2024):
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

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

SymbolSourceReference
Bpd-NaNaIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of Betpakdalite-NaNaHide

Lustre:
Sub-Adamantine, Vitreous
Transparency:
Transparent
Colour:
Yellow
Streak:
Colorless to very pale yellow
Hardness:
3 on Mohs scale
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

Chemistry of Betpakdalite-NaNaHide

Mindat Formula:
[Na2(H2O)16Na(H2O)6][Mo8As2Fe3+3O33(OH)4]
Elements listed:
As, Fe, H, Mo, Na, O - search for minerals with similar chemistry

Crystallography of Betpakdalite-NaNaHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/m
Setting:
C2/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 Å(27)
9.640 Å(30)
8.930 Å(100)
7.389 Å(33)
3.697 Å(25)
3.168 Å(25)
2.980 Å(24)
2.862 Å(27)

Geological EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
Stage 7: Great Oxidation Event<2.4
47a : [Near-surface hydration of prior minerals]
47d : [Arsenates, antimonates, selenates, bismuthinates]

Type Occurrence of Betpakdalite-NaNaHide

Type Locality:
ⓘ Chuquicamata Mine, Chuquicamata District, Calama, El Loa Province, Antofagasta, Chile
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:
TopazScoroditeQuartzQuartzLeightonite
JarositeGoethite

Synonyms of Betpakdalite-NaNaHide

Other Language Names for Betpakdalite-NaNaHide

Relationship of Betpakdalite-NaNa to other SpeciesHide

Member of:
Betpakdalite Group > Betpakdalite Supergroup
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+3O37]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 - Strunz-mindat GroupingHide

8.BM.Gunmaite(Na2Sr)Sr2Al10(PO4)4F14(OH)12Trig. 3m (3 2/m) : R3m
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.

Internet Links for Betpakdalite-NaNaHide

References 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 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.
Chile (TL)
 
  • Antofagasta
    • El Loa Province
      • Calama
        • Chuquicamata District
Williams, P. A., Hatert, F., Pasero, M., Mills, S. J. (2011) New minerals and nomenclature modifications approved in 2011. CNMNC Newsletter No 11. Mineralogical Magazine, 75 (6) 2887-2893 doi:10.1180/minmag.2011.075.6.2887
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
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