Betpakdalite-CaMg (original) (raw)

A valid IMA mineral species

About Betpakdalite-CaMgHide

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Formula:

[Ca2(H2O)17Mg(H2O)6][Mo8As2Fe3+3O36(OH)]

Lustre:

Sub-Adamantine, Vitreous

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.

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:41944:4

924c28b4-6a69-4ae6-85eb-76bf4404e94b

IMA Classification of Betpakdalite-CaMgHide

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IMA Formula:

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

Classification of Betpakdalite-CaMgHide

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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

Mineral SymbolsHide

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

Physical Properties of Betpakdalite-CaMgHide

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Streak:

Colorless to very pale yellow

Fracture:

Irregular/Uneven

Density:

2.98(4) g/cm3 (Measured) 2.944 g/cm3 (Calculated)

Optical Data of Betpakdalite-CaMgHide

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RI values:

_n_α = 1.818(3) _n_β = 1.824(3) _n_γ = 1.846(3)

2V:

Measured: 55° (2), Calculated: 55.7°

δ = 0.028

Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.

Pleochroism:

Non-pleochroic

Chemistry of Betpakdalite-CaMgHide

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Mindat Formula:

[Ca2(H2O)17Mg(H2O)6][Mo8As2Fe3+3O36(OH)]

Crystallography of Betpakdalite-CaMgHide

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Crystal System:

Monoclinic

Class (H-M):

2/m - Prismatic

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

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

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Powder Diffraction Data:

Geological EnvironmentHide

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Type Occurrence of Betpakdalite-CaMgHide

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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

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Other Language Names for Betpakdalite-CaMgHide

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Relationship of Betpakdalite-CaMg to other SpeciesHide

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Other Members of this group:

Common AssociatesHide

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Associated Minerals Based on Photo Data:

Related Minerals - Strunz-mindat GroupingHide

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Other InformationHide

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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-CaMgHide

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References for Betpakdalite-CaMgHide

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Reference List:

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

Localities for Betpakdalite-CaMgHide

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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

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- 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.