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About Betpakdalite-NaCaHide

Specific Gravity:
Crystal System:
The name reflects its sodium content and similarity to betpakdalite. First described by Skvortsova et al. (1971) as sodium betpakdalite, later renamed as natrobetpakdalite by Burke (2008). Redefined in 2010 by IMA and renamed as Betpakdalite-NaCa.
Betpakdalite Group.

Formerly called natrobetpakdalite; in 2010 (IMA 10-E).

Classification of Betpakdalite-NaCaHide

Renamed by the IMA
Approval History:
Renamed by IMA: 2010

D : Phosphates, etc. with additional anions, with H2O
M : With large and medium-sized cations, (OH, etc.):RO4 > 2:1

4 : Compound Molybdates and Tungstates

22 : Phosphates, Arsenates or Vanadates with other Anions
5 : Phosphates, arsenates or vanadates with chromate, molybdate, niobate or tantalate

Physical Properties of Betpakdalite-NaCaHide

Dull in aggregates
2.02 g/cm3 (Measured)    2.892 g/cm3 (Calculated)

Optical Data of Betpakdalite-NaCaHide

RI values:
nα = 1.792 nγ = 1.810
Max Birefringence:
δ = 0.018
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
r > v perceptible
Distinct: X = pale yellow; Z = yellow Z > X

Chemical Properties of Betpakdalite-NaCaHide



Crystallography of Betpakdalite-NaCaHide

Crystal System:
Class (H-M):
2/m - Prismatic
Space Group:
Cell Parameters:
a = 19.41(3) Å, b = 11.12(4) Å, c = 15.26(3) Å
β = 131.13(7)°
a:b:c = 1.746 : 1 : 1.372
Unit Cell V:
2481 ų
Pseudohexagonal crystals, very thin, platy, to several μ; as powdery aggregates, crusts, and films.
Cell parameters from SCXRD-WPF (Kampf et al 2012)

Type Occurrence of Betpakdalite-NaCaHide

General Appearance of Type Material:
Secondary mineral
Geological Setting of Type Material:
Formed in the oxidation zone of a Mo–U deposit.
Associated Minerals at Type Locality:

Synonyms of Betpakdalite-NaCaHide

Other Language Names for Betpakdalite-NaCaHide

Relationship of Betpakdalite-NaCa 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-NaNa[Na2(H2O)16Na(H2O)6][Mo8As2Fe3+3O33(OH)4] Mon. 2/m : B2/m

Common AssociatesHide

Associated Minerals Based on Photo Data:
5 photos of Betpakdalite-NaCa associated with BandyliteCu[B(OH)4]Cl
4 photos of Betpakdalite-NaCa associated with HexahydriteMgSO4 · 6H2O
4 photos of Betpakdalite-NaCa associated with NitratineNaNO3
4 photos of Betpakdalite-NaCa associated with BloediteNa2Mg(SO4)2 · 4H2O

Related Minerals - Nickel-Strunz GroupingHide

8.DM.Betpakdalite-CaMg[Ca2(H2O)17Mg(H2O)6][Mo8As2Fe3+3O36(OH)] Mon. 2/m : B2/m
8.DM.Betpakdalite-FeFe[Fe3+2 (H2O)15(OH)2Fe3+(H2O)6][Mo8As2Fe3+3 O37]Mon. 2/m : B2/m
8.DM.05MoriniteNaCa2Al2(PO4)2(OH)F4 · 2H2OMon. 2/m
8.DM.05EsperanzaiteNaCa2Al2(AsO4)2(OH)F4 · 2H2OMon.
8.DM.10TyroliteCa2Cu9(AsO4)4(CO3)(OH)8 · 11H2OMon. 2/m
8.DM.15Betpakdalite-CaCa[Ca2(H2O)17Ca(H2O)6][Mo6+8As5+2Fe3+3O36(OH)]Mon. 2/m : B2/m
8.DM.15Melkovite[Ca2(H2O)15Ca(H2O)6][Mo8P2Fe3+3O36(OH)]Mon. 2/m : B2/m
8.DM.20Phosphovanadylite-CaCa[V4+4P2O12(OH)4] · 12H2O Iso. 4 3m : I4 3m
8.DM.25YukoniteCa3Fe3+(AsO4)2(OH)3 · 5H2OOrth. mm2
8.DM.30UdumineliteCa3Al8(PO4)2O12 · 2H2O
8.DM.35DelvauxiteCaFe4(PO4,SO4)2(OH)8 · 4-6H2O not confirmedAmor.
8.DM.40Santafeite(Na,Ca,Sr)12(Mn2+,Fe3+,Al,Mg)8Mn4+8(VO4)16(OH,O)20 · 8H2OOrth. mmm (2/m 2/m 2/m)

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

22.5.1VauquelinitePb2Cu(CrO4)(PO4)(OH)Mon. 2/m
22.5.2EmbreyitePb5(CrO4)2(PO4)2 · H2OMon. 2/m : B2/m
22.5.3CassedanneitePb5(CrO4)2(VO4)2 · H2OMon.
22.5.4FornacitePb2Cu(CrO4)(AsO4)(OH)Mon. 2/m : P21/b
22.5.6Mendozavilite-NaFe[Na2(H2O)15Fe3+(H2O)6][Mo8P2Fe3+3O35(OH)2]Mon. 2/m : B2/m
22.5.8Betpakdalite-CaCa[Ca2(H2O)17Ca(H2O)6][Mo6+8As5+2Fe3+3O36(OH)]Mon. 2/m : B2/m
22.5.10Obradovicite-KCu[K2(H2O)17Cu(H2O)6][Mo8As2Fe3+3O34(OH)3]Orth. mmm (2/m 2/m 2/m) : Pmna
22.5.11Melkovite[Ca2(H2O)15Ca(H2O)6][Mo8P2Fe3+3O36(OH)]Mon. 2/m : B2/m
22.5.12RankachiteCa0.5(V4+,V5+)(W6+,Fe3+)2O8(OH) · 2H2OMon. 2/m : P21/m
22.5.13OlmsteaditeKFe2+2(Nb5+,Ta5+)(PO4)2O2 · 2H2OOrth.
22.5.14JohnwalkiteK(Mn2+,Fe2+,Fe3+)2(Nb5+,Ta5+)(PO4)2O2 · 2(H2O,OH)Orth.

Other InformationHide

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-NaCaHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Skvortsova K. V., Sidorenko G A, Nesterova Y S, Arapova G A, Dara A D, Rybakova L I (1971) Sodium betpakdalite and conditions of its formation. Zapiski Vsesoyuznogo Mineralogicheskogo Obshchestva: 100 (5): 603-611.
American Mineralogist (1972): 57: 1312.
Canadian Mineralogist (1999): 37: 61-66.
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-NaCaHide

Localities for Betpakdalite-NaCaHide

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.
  • Antofagasta
    • Antofagasta Province
      • Cerro Palestina
        • Estación Cerro Negro
Lukasz Kruszewski
Brent Thorne collection. Previously in the collection of Dr. Wilke.
Kazakhstan (TL)
  • Jambyl Region
    • Moiynkum
      • Chu-Ili Mts
Skvortsova K V, Sidorenko G A, Nesterova Y S, Arapova G A, Dara A D, Rybakova L I (1971) Sodium betpakdalite and conditions of its formation. Zapiski Vsesoyuznogo Mineralogicheskogo Obshchestva 100, issue 5, 603-611; 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
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