Komkovite (original) (raw)

A valid IMA mineral species

About KomkoviteHide

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Formula:

BaZr[Si3O9] · 3H2O

Name:

Named in honor of Aleksandr Ivanovich Komkov (Александр Иванович Комков) (1926-1987), mineralogist and crystallographer at the Karpinskii All-Union Research Institute of Geology, St. Petersburg, Russia.

Possibly formed (type material) by alteration of catapleiite.

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:2247:3

d8cc8152-f58c-4c7c-b7ce-34a821c166e8

IMA Classification of KomkoviteHide

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IMA Formula:

BaZrSi3O9 · 3H2O

Type description reference:

Classification of KomkoviteHide

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9.DM.10

9 : SILICATES (Germanates)
D : Inosilicates
M : Inosilicates with 6-periodic single chains

59.2.4.1

59 : CYCLOSILICATES Three-Membered Rings
2 : Three-Membered Rings, hydrated

14.10.31

14 : Silicates not Containing Aluminum
10 : Silicates of Zr or Hf

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 KomkoviteHide

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Density:

3.31 g/cm3 (Measured) 3.31 g/cm3 (Calculated)

Optical Data of KomkoviteHide

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RI values:

_n_ω = 1.671 _n_ε = 1.644

δ = 0.027

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

Chemistry of KomkoviteHide

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Mindat Formula:

BaZr[Si3O9] · 3H2O

Common Impurities:

Hf,Fe,Ca,K

Crystallography of KomkoviteHide

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Class (H-M):

32 - Trapezohedral

Cell Parameters:

a = 10.52 Å, c = 15.73 Å

Unit Cell V:

1,507.62 ų (Calculated from Unit Cell)

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 KomkoviteHide

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General Appearance of Type Material:

Equant crystals, 1-5 mm across, with trigonal pyramidal faces.

Place of Conservation of Type Material:

Geology Museum, Kola Branch, Academy of Sciences, Apatity.
Mining Institute, St. Petersburg, 2037/1.
A.E. Fersman Mineralogical Museum, Academy of Sciences, Moscow, Russia, p462/1.

Geological Setting of Type Material:

In dolomitic veinlets that cut metasomatically altered pyroxenites in a carbonatite complex.

Associated Minerals at Type Locality:

Reference:

Voloshin, A.V., Pakhomovskiy, Y.Y., Men'shikov, Y.P., Sokolova, Y.V., Yegorov-Tismenko, Y.K. (1990) Komkovite - A new hydrous barium zirconosilicate from the carbonatites of Vuoriyarvi (Kola Peninsula). Mineralogiceskij Zhurnal: 12: 69-73.

Synonyms of KomkoviteHide

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Other Language Names for KomkoviteHide

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Relationship of Komkovite to other SpeciesHide

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Other Members of this group:

Related Minerals - Strunz-mindat GroupingHide

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Fluorescence of KomkoviteHide

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Other InformationHide

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IR Spectrum:

Absorption features at 3540, 3510, 1665, 1650, 1045, 970, 920, 740, 545, and 495 cm-1. The first four correspond to molecular H2O.

Thermal Behaviour:

One endothermic peak at 140 °C corresponding to the maximum loss of H2O, which is lost completely at 600 °C.

Notes:

Light blue cathodoluminescence.

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 KomkoviteHide

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References for KomkoviteHide

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Localities for KomkoviteHide

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ⓘ - 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.