Kogarkoite (original) (raw)

A valid IMA mineral species

About KogarkoiteHide

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Colour:

White, pale blue, pale pink

Crystal System:

Monoclinic

Name:

Named in honor of Lia Nikolaevna Kogarko (Лия Николаевна Когарко) (b. 17 May 1936, Moscow, USSR), Russian geochemist at the Department of Earth Sciences, Russian Academy of Sciences (RAS). She first found the mineral, naming it 'chlorine-free schairerite'.

Has low solubility at high temperatures in the presence of water vapor.

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:2236:7

e2ca9e29-b7cc-49d9-b6e8-ed921264eca0

IMA Classification of KogarkoiteHide

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Type description reference:

Classification of KogarkoiteHide

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7.BD.15

7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
B : Sulfates (selenates, etc.) with additional anions, without H2O
D : With only large cations

30.1.6.1

30 : ANHYDROUS SULFATES CONTAINING HYDROXYL OR HALOGEN
1 : (AB)m(XO4)pZq, where m:p>2:1

26.1

26 : Sulphates with Halide

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 KogarkoiteHide

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Transparency:

Transparent, Translucent

Colour:

White, pale blue, pale pink

Density:

2.66(6) g/cm3 (Measured) 2.676 g/cm3 (Calculated)

Comment:

Calculated density from Fanfani et al. (1980).

Optical Data of KogarkoiteHide

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RI values:

_n_α = 1.439(1) _n_β = 1.439(1) _n_γ = 1.442(1)

Birefringence:

0.0029(3), determined by Berek compensator on two synthetic crystals, 0.36 and 0.33 mm thick.

δ = 0.003

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

Dispersion:

dispersion not observed

Comments:

Very nearly uniaxial

Chemistry of KogarkoiteHide

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Crystallography of KogarkoiteHide

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Crystal System:

Monoclinic

Class (H-M):

2/m - Prismatic

Cell Parameters:

a = 18.079(2) Å, b = 6.958(1) Å, c = 11.443(2) Å
β = 107.71°

Ratio:

a:b:c = 2.598 : 1 : 1.645

Twinning:

Common, by rotation about [102] (or pseudohexagonal [0001]), giving intergrown and contact trillings.

Comment:

Cell parameters from Fanfani et al. (1980). Note that a=18.074 in abstract but 18.079 in body.

Crystal StructureHide

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X-Ray Powder DiffractionHide

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Powder Diffraction Data:

Geological EnvironmentHide

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Type Occurrence of KogarkoiteHide

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General Appearance of Type Material:

Pale blue grains and aggregates occupying interstices between nepheline and feldspar.

Place of Conservation of Type Material:

National Museum of Natural History, Washington, D.C., USA, 127420, 128029, 128030.

Geological Setting of Type Material:

In nepheline syenite pegmatite (at Lovozero).

Associated Minerals at Type Locality:

Reference:

Pabst, A., Sharp, W.N. (1973) Kogarkoite, a new natural phase in the system Na2SO4- NaF- NaCl. American Mineralogist: 58: 116-127.

Synonyms of KogarkoiteHide

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Other Language Names for KogarkoiteHide

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Common AssociatesHide

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Associated Minerals Based on Photo Data:

Related Minerals - Strunz-mindat GroupingHide

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Fluorescence of KogarkoiteHide

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Fluoresces cream to pale blue under SW UV and green under LW UV.

Other InformationHide

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Thermal Behaviour:

Melting point 781 °C.

Notes:

Slowly soluble in H2O.

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 KogarkoiteHide

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References for KogarkoiteHide

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Reference List:

Žáček, V., Rapprich, V., Šíma, J., Škoda, R., Laufek, F., Legesa, F. (2015) Kogarkoite, Na3(SO4)F, from the Shalo hot spring, Main Ethiopian Rift: implications for F-enrichment of thermal groundwater related to alkaline silicic volcanic rocks. Journal of Geosciences: 60(3): 171-179.

Solotchin, P.A., Sklyarov, E.V., Solotchina, E.P., Zamana, L.V., Sklyarova, O.A., Solotchin, P.A., Sklyarov, E.V., Solotchina, E.P., Zamana, L.V., Sklyarova, O.A. (2015) A new find of Kogarkoite (Na3SO4F) in Transbaikalia. Doklady Earth Sciences: 462(2): 643-647.

Localities for KogarkoiteHide

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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.