Koragoite (original) (raw)

A valid IMA mineral species

About KoragoiteHide

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Formula:

(Mn2+,Fe3+)3(Nb,Ta,Ti)2(Nb,Mn)2(W,Ta)2O20

Colour:

Red to dark red-brown

Specific Gravity:

4.70 (Calculated)

Crystal System:

Monoclinic

Name:

Named after Aleksei Aleksandrovich Korago (Алексей Александрович Кораго) (1942–1993), geologist who investigated the formation of river pearls in the Arkhangel'sk district of Russia, and the origin of amber.

This page provides mineralogical data about Koragoite.

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:7140:2

92df0774-ca43-46fb-8d74-269d3825a5a1

IMA Classification of KoragoiteHide

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IMA Formula:

Mn2+2Mn3+Nb2(Nb,Ta)3W2O20

Type description reference:

Classification of KoragoiteHide

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4.DE.10

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
D : Metal: Oxygen = 1:2 and similar
E : With medium-sized cations; with various polyhedra

8.7.12.1

8 : MULTIPLE OXIDES CONTAINING NIOBIUM,TANTALUM OR TITANIUM
7 : Miscellaneous

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 KoragoiteHide

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Colour:

Red to dark red-brown

Hardness:

VHN50=550 kg/mm2 - Vickers

Density:

4.70(1) g/cm3 (Calculated)

Optical Data of KoragoiteHide

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Colour in reflected light:

Gray

Chemistry of KoragoiteHide

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Mindat Formula:

(Mn2+,Fe3+)3(Nb,Ta,Ti)2(Nb,Mn)2(W,Ta)2O20

Crystallography of KoragoiteHide

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Crystal System:

Monoclinic

Class (H-M):

2 - Sphenoidal

Cell Parameters:

a = 24.73 Å, b = 5.056 Å, c = 5.760 Å
β = 103.5°

Ratio:

a:b:c = 4.891 : 1 : 1.139

Unit Cell V:

700.30 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 KoragoiteHide

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General Appearance of Type Material:

Thin, commonly bent, platy crystals 1–3 mm across and 0.1–0.3 mm thick.

Place of Conservation of Type Material:

Fersman Mineralogical Museum, Moscow.

Geological Setting of Type Material:

Associated Minerals at Type Locality:

Reference:

Voloshin, A.V., Pakhomovskiey, Y.A., Bakhchisa, A.Y. (1997) Koragoite - a new mineral from granitic pegmatites of the southwestern Pamirs, Tajikistan (Russian). Doklady Akademii Nauk SSSR Earth Science Sections: 353: 516-518.

Synonyms of KoragoiteHide

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Other Language Names for KoragoiteHide

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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 KoragoiteHide

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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 KoragoiteHide

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References for KoragoiteHide

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Localities for KoragoiteHide

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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.