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Betpakdalite-CaMg

A valid IMA mineral species
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First recognized as a potential hypothetical member of the betpakdalite group (IMA 10-E). In 2012 it was approved by IMA as a valid species.
Type Locality:
ⓘTsumeb Mine (Ongopolo Mine), Tsumeb, Oshikoto Region, Namibia
First found in the 35th level of theTsumeb Mine, Namibia.


Unique Identifiers
IMA Formula:
[Ca2(H2O)17Mg(H2O)6][Mo6+8As5+2Fe3+3O36(OH)]
Approval year:
2011
First published:
2012

Classification of Betpakdalite-CaMg

Mineral Symbols
Transparency:
Transparent
Colour:
Yellow
Streak:
Colorless to very pale yellow
Hardness:
3½ onMohs scale
Tenacity:
Brittle
Cleavage:
Perfect
{001}
Fracture:
Irregular/Uneven
Density:
2.98(4) g/cm3 (Measured)    2.944 g/cm3 (Calculated)

Optical Data of Betpakdalite-CaMg
Surface Relief:
Very High
Dispersion:
r > v, strong
Pleochroism:
Non-pleochroic

Chemistry of Betpakdalite-CaMg

Crystallography of Betpakdalite-CaMg
General Appearance of Type Material:
Yellow pseudo-octaedra (up to ~1mm) included in and on scorodite
Place of Conservation of Type Material:
Natural History Museum of Los Angeles County, Los Angeles, California, USA, catalogue numbers 63327 and 63328
Associated Minerals at Type Locality:
DjurleiteQuartzScorodite

Synonyms of Betpakdalite-CaMg

Other Language Names for Betpakdalite-CaMg

Relationship of Betpakdalite-CaMg to other Species
Other Members of Betpakdalite Group:
Betpakdalite-CaCa[Ca2(H2O)17Ca(H2O)6][Mo6+8As5+2Fe3+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
Betpakdalite-NaNa[Na2(H2O)16Na(H2O)6][Mo8As2Fe3+3O33(OH)4]Mon. 2/m :B2/m

Common AssociatesTrig.3m(32/m) :R3m8.DM.ElliottiteNaMgAl3(PO4)2F6 · 9H2OMon. 2/m :B2/m8.DM.Betpakdalite-FeFe[Fe3+2 (H2O)15(OH)2Fe3+(H2O)6][Mo8As2Fe3+3O37]Mon. 2/m :B2/m8.DM.Penriceite[Mg(H2O)6][Na(H2O)2Al3(PO4)2F6] · H2OMon. 2/m :P21/b8.DM.Chinnerite[Mg(H2O)6]Na(H2O)2Al3(PO4)2F6Mon. 2/m :P2/m8.DM.Sarrochite[Ca4(H2O)38][Mo8P2Fe3+3O37(OH)]Trig.3m(32/m) :P3m18.DM.05EsperanzaiteNaCa2Al2(AsO4)2(OH)F4 · 2H2OMon. 2/m :P21/m8.DM.05MoriniteNaCa2Al2(PO4)2(OH)F4 · 2H2OMon. 2/m :P21/m8.DM.10TangdaniteCa2Cu9(AsO4)4(SO4)0.5(OH)9 · 9H2OMon. 2/m :B2/b8.DM.10TyroliteCa2Cu9(AsO4)4(CO3)(OH)8 · 11H2OMon. 2/m8.DM.15Melkovite[Ca2(H2O)15Ca(H2O)6][Mo8P2Fe3+3O36(OH)]Mon. 2/m :B2/m8.DM.15Betpakdalite-NaCa[Na2(H2O)17Ca(H2O)6][Mo6+8As5+2Fe3+3O34(OH)3]Mon. 2/m :B2/m8.DM.15Betpakdalite-CaCa[Ca2(H2O)17Ca(H2O)6][Mo6+8As5+2Fe3+3O36(OH)]Mon. 2/m :B2/m8.DM.20Phosphovanadylite-BaBa[V4+4P2O8(OH)8] · 12H2OIso.43m :I43m8.DM.20Phosphovanadylite-CaCa[V4+4P2O12(OH)4] · 12H2OIso.43m :I43m8.DM.25YukoniteCa3Fe3+(AsO4)2(OH)3 · 5H2OOrth.mm28.DM.30UdumineliteCa3Al8(PO4)2O12 · 2H2O8.DM.35Aldermanite[Mg(H2O)6][Na(H2O)2Al3(PO4)2(OH,F)6] · H2OMon. 2/m :P21/b8.DM.35AzovskiteFe3+3(PO4)(OH)6 or near8.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/m2/m2/m)8.DM.55TapiaiteCa5Al2(AsO4)4(OH)4 · 12H2OMon.8.DM.60Alcantarillaite[Fe3+0.5(H2O)4][CaAs3+2(Fe3+2.5W6+0.5)(AsO4)2O7]Orth.mmm(2/m2/m2/m) :Imma

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    • References for Betpakdalite-CaMgⓘElsmore Tin Mine (Elsmore Tin lodes)Rankin et al. (2002)
    France
     
    Christophe Boutry collection
    Germany
     
    Färber (n.d.)
    Italy
     
    Gentile et al. (2023)Marco Bonifazi collection
    Namibia (TL)
     
    Williams et al. (2011)+1 other reference
    Russia
     
    Kasatkin et al. (2014)
    UK
     
    Rumsey (2022)
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