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Betpakdalite-CaMg

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About Betpakdalite-CaMgHide

Formula:
[Ca2(H2O)17Mg(H2O)6][Mo8As2Fe3+3O36(OH)]
Colour:
Yellow
Lustre:
Sub-Adamantine, Vitreous
Hardness:
Specific Gravity:
2.98
Crystal System:
Monoclinic
Name:
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.
First found in the 35th level of the Tsumeb Mine, Namibia.


Classification of Betpakdalite-CaMgHide

Approved
Approval Year:
2011
First Published:
2012
8.DM.

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

Physical Properties of Betpakdalite-CaMgHide

Sub-Adamantine, Vitreous
Transparency:
Transparent
Colour:
Yellow
Streak:
Colorless to very pale yellow
Hardness:
3½ on Mohs 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-CaMgHide

Type:
Biaxial (+)
RI values:
nα = 1.818(3) nβ = 1.824(3) nγ = 1.846(3)
2V:
Measured: 55° (2), Calculated: 55.7°
Max Birefringence:
δ = 0.028
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 Betpakdalite-CaMgHide

Formula:
[Ca2(H2O)17Mg(H2O)6][Mo8As2Fe3+3O36(OH)]
IMA Formula:
[Ca2(H2O)17Mg(H2O)6][Mo6+8As5+2Fe3+3O36(OH)]

Crystallography of Betpakdalite-CaMgHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/m
Setting:
C2/m
Cell Parameters:
a = 19.5336(7) Å, b = 11.0637(4) Å, c = 15.2559(11) Å
β = 131.528(9)°
Ratio:
a:b:c = 1.766 : 1 : 1.379
Unit Cell V:
2468.3 ų
Morphology:
Pseudo-octaedra. Forms observed: {001}, {1-10} and [20-1}.
Twinning:
Uncommon. Contact twins on (001) by rotation of 120° about [102] and as pentetration twins by rotation of 120° about [102].

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
11.568(25)
8.971(100)
7.341(34)
3.656(33)
3.143(26)
2.965(44)
2.817(35)
2.662(31)

Type Occurrence of Betpakdalite-CaMgHide

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:

Synonyms of Betpakdalite-CaMgHide

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

Related Minerals - Nickel-Strunz GroupingHide

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.10ClinotyroliteCa2Cu9(AsO4,SO4)4(OH,O)10 · 10H2OMon.
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.15Betpakdalite-NaCa[Na2(H2O)17Ca(H2O)6][Mo6+8As5+2Fe3+3O34(OH)3]Mon. 2/m : B2/m
8.DM.20Phosphovanadylite-BaBa[V4+4P2O8(OH)8]·12H2OIso.
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 confirmed · Amor.
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)

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-CaMgHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Williams, P.A., Hatert, F., Pasero, M., Mills, S.J. (2011) IMA Commission on new minerals, nomenclature and classification (CNMNC) Newsletter 7. New minerals and nomenclature modifications approved in 2010. Mineralogical Magazine: 75: 27-31.
Kampf, A.R., Mills, S.J. (2011) Betpakdalite-CaMg, IMA 2011-034. CNMNC Newsletter No. 10, October 2011, page 2556.
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., and Pinch, W.W. (2012) The heteromolybdate family: structural relations, nomenclature scheme and new species. Mineralogical Magazine: 76(5): 1175-1207.

Internet Links for Betpakdalite-CaMgHide

Localities for Betpakdalite-CaMgHide

ⓘ - 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.
Australia
 
  • New South Wales
    • Gough Co.
      • Elsmore
Rankin, J., Lawrence, L. J., Sharpe, J. L. and Williams, P. A. (2002): Rare secondary bismuth, tungsten and molybdenum minerals from Elsmore, New England district of New South Wales. Australian Journal of Mineralogy 8, 55-60.
Germany
 
  • Saxony
    • Erzgebirge
      • Schmiedeberg
Gunnar Färber
Namibia (TL)
 
  • Oshikoto Region (Otjikoto Region)
    • Tsumeb
Kampf, A.R. and Mills, S.J. (2011): Betpakdalite-CaMg, IMA 2011-034. CNMNC Newsletter No. 10, October 2011, page 2556
Mineral and/or Locality  
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