Kurgantaite (original) (raw)

A valid IMA mineral species - grandfathered

About KurgantaiteHide

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Formula:

CaSr[B5O9]Cl · H2O

Colour:

Colourless to white

Name:

Named for the type locality, Kargan-tau, Kazakhstan.

Hilgardite Group.

1952 described as a new mineral, 1982 discredited as a strontian variety of tyretskite, 2000 revalidated and approved by the IMA.

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:8212:5

6427fb83-c41b-4427-99c2-3150d7e18481

IMA Classification of KurgantaiteHide

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Approved, 'Grandfathered' (first described prior to 1959)

IMA Formula:

CaSrB5O9Cl · H2O

Approval history:

IMA Code 00-B - Kurgantaite revalidated (2002).

Classification of KurgantaiteHide

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6.ED.05

6 : BORATES
E : Pentaborates
D : Tekto-pentaborates

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 KurgantaiteHide

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Colour:

Colourless to white

Fracture:

Irregular/Uneven

Density:

2.99 g/cm3 (Measured) 3.04 g/cm3 (Calculated)

Optical Data of KurgantaiteHide

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RI values:

_n_α = 1.637 _n_β = 1.638 _n_γ = 1.675

δ = 0.038

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

Pleochroism:

Non-pleochroic

Chemistry of KurgantaiteHide

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Mindat Formula:

CaSr[B5O9]Cl · H2O

Crystallography of KurgantaiteHide

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Cell Parameters:

a = 6.573 Å, b = 6.445 Å, c = 6.369 Å
α = 60.995°, β = 61.257°, γ = 77.191°

Ratio:

a:b:c = 1.02 : 1 : 0.988

X-Ray Powder DiffractionHide

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Powder Diffraction Data:

Comments:

Chelkar salt dome, Kazakhstan. The data are from Pekov et al. (2001).

Geological EnvironmentHide

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Type Occurrence of KurgantaiteHide

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General Appearance of Type Material:

Fine-grained nodules up to 4 cm across.

Place of Conservation of Type Material:

A. E. Fersman Mineralogical Museum, Moscow, Russia (neotype).

Geological Setting of Type Material:

Associated Minerals at Type Locality:

Synonyms of KurgantaiteHide

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Other Language Names for KurgantaiteHide

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Relationship of Kurgantaite to other SpeciesHide

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Other Members of this group:

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 KurgantaiteHide

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References for KurgantaiteHide

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Localities for KurgantaiteHide

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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.