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Koragoite

A valid IMA mineral species

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Photos of Koragoite (6)

Koragoite Gallery Search Photos of Koragoite

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Koragoite

Vez-Dara River Valley, Shakhdara Range, Shughnon, Gorno-Badakhshan, Tajikistan

Koragoite

Vez-Dara River Valley, Shakhdara Range, Shughnon, Gorno-Badakhshan, Tajikistan

Koragoite

Vez-Dara River Valley, Shakhdara Range, Shughnon, Gorno-Badakhshan, Tajikistan

Koragoite

Vez-Dara River Valley, Shakhdara Range, Shughnon, Gorno-Badakhshan, Tajikistan

Koragoite

Vez-Dara River Valley, Shakhdara Range, Shughnon, Gorno-Badakhshan, Tajikistan

Koragoite

Vez-Dara River Valley, Shakhdara Range, Shughnon, Gorno-Badakhshan, Tajikistan

Koragoite

Vez-Dara River Valley, Shakhdara Range, Shughnon, Gorno-Badakhshan, Tajikistan

Koragoite

Vez-Dara River Valley, Shakhdara Range, Shughnon, Gorno-Badakhshan, Tajikistan

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About KoragoiteHide

Formula:

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

Colour:

Red to dark red-brown

Lustre:

Metallic

Hardness:

4 - 5

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.

Type Locality:

ⓘ Vez-Dara River Valley, Shakhdara Range, Shughnon, Gorno-Badakhshan, Tajikistan

This page provides mineralogical data about Koragoite.

Unique IdentifiersHide

Mindat ID:

7140

Long-form identifier:

mindat:1:1:7140:2

GUID
(UUID V4):

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

IMA Classification of KoragoiteHide

IMA status:

Approved

IMA Formula:

Mn²⁺₂Mn³⁺Nb₂(Nb,Ta)₃W₂O₂₀

Approval year:

1994

First published:

1997

Type description 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.

Classification of KoragoiteHide

Strunz-mindat (2024):

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

Dana 8th ed.:

8.7.12.1

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

Mineral SymbolsHide

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

Symbol	Source	Reference
Kgo	IMA–CNMNC	Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of KoragoiteHide

Lustre:

Metallic

Colour:

Red to dark red-brown

Streak:

Grayish brown

Hardness:

4 - 5 on Mohs scale

Hardness:

VHN₅₀=550 kg/mm² - Vickers

Cleavage:

None Observed

Density:

4.70(1) g/cm³ (Calculated)

Optical Data of KoragoiteHide

Anisotropism:

Distinct

Colour in reflected light:

Gray

Internal Reflections:

Red

Chemistry of KoragoiteHide

Mindat Formula:

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

Elements listed:

Fe, Mn, Nb, O, Ta, Ti, W - search for minerals with similar chemistry

Crystallography of KoragoiteHide

Crystal System:

Monoclinic

Class (H-M):

2 - Sphenoidal

Space Group:

P2₁

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 Å³ (Calculated from Unit Cell)

Crystal StructureHide

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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure

ID	Species	Reference	Link	Year	Locality	Pressure (GPa)	Temp (K)
0014194	Koragoite	Yamnova N A, Pushcharovskii D Yu, Voloshin A V (1995) Crystal structure of a new natural Mn, W-tantaloniobate Kristallografiya 40 469-475		1995		0	293

CIF Raw Data - click here to close

data_global
_chemical_name_mineral 'Koragoite'
loop_
_publ_author_name
'Yamnova N A'
'Pushcharovskii D Yu'
'Voloshin A V'
_journal_name_full 'Kristallografiya'
_journal_volume 40 
_journal_year 1995
_journal_page_first 469
_journal_page_last 475
_publ_section_title
;
 Crystal structure of a new natural Mn, W-tantaloniobate
;
_database_code_amcsd 0014194
_chemical_formula_sum 'Mn3.16 Fe.1 Ta.652 W1.807 Nb3.6 Ti.09 O20'
_cell_length_a 24.73
_cell_length_b 5.056
_cell_length_c 5.760
_cell_angle_alpha 90
_cell_angle_beta 103.5
_cell_angle_gamma 90
_cell_volume 700.302
_exptl_crystal_density_diffrn      6.109
_symmetry_space_group_name_H-M 'P 1 21 1'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '-x,1/2+y,-z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_occupancy
_atom_site_U_iso_or_equiv
MnA1   0.60250   0.23900   0.76000   0.90000   0.01900
FeA1   0.60250   0.23900   0.76000   0.10000   0.01900
MnA2   0.30110   0.26300   0.97000   1.00000   0.03040
MnA3   0.10100   0.75100   0.44900   0.86000   0.02533
TaB1   0.80243   0.27250   0.98360   0.65200   0.00456
WB1   0.80243   0.27250   0.98360   0.09700   0.00456
NbB2   0.19790   0.26700   0.38620   1.00000   0.00253
NbB3   0.69920   0.27600   0.36970   1.00000   0.01051
NbBA1   0.10030   0.28710   0.78740   0.80000   0.01406
MnBA1   0.10030   0.28710   0.78740   0.20000   0.01406
NbBA2   0.39880   0.26700   0.58240   0.80000   0.00709
MnBA2   0.39880   0.26700   0.58240   0.20000   0.00709
WC1  -0.00066   0.28750   0.16450   0.90000   0.00443
WC2   0.50031   0.25810   0.19160   0.81000   0.00456
TiC2   0.50031   0.25810   0.19160   0.09000   0.00456
O1   0.44600   0.11000   0.30100   1.00000   0.02153
O2   0.24700   0.11700   0.12900   1.00000   0.00633
O3   0.15500   0.44900   0.55000   1.00000   0.08106
O4   0.44600   0.61400   0.54500   1.00000   0.01773
O5   0.04900   0.13100   0.42000   1.00000   0.00760
O6   0.24300   0.62700   0.36100   1.00000   0.00127
O7   0.34000   0.46100   0.73600   1.00000   0.00760
O8   0.25100   0.10100   0.61100   1.00000   0.03673
O9   0.15600   0.95000   0.27500   1.00000   0.01013
O10   0.35000   0.43700   0.20100   1.00000   0.01267
O11   0.14800   0.93800   0.75300   1.00000   0.01013
O12   0.25800   0.60300   0.87600   1.00000   0.01140
O13   0.15800   0.47600   0.06800   1.00000   0.02660
O14   0.04500   0.60000   0.14400   1.00000   0.00760
O15   0.35500   0.93200   0.44600   1.00000   0.00253
O16   0.05000   0.14000   0.95000   1.00000   0.05446
O17   0.45500   0.07900   0.82500   1.00000   0.01140
O18   0.33900   0.96200   0.93400   1.00000   0.00253
O19   0.04700   0.63400   0.67400   1.00000   0.00507
O20   0.45400   0.56200   0.05700   1.00000   0.01773

X-Ray Powder DiffractionHide

Powder Diffraction Data:

d-spacing	Intensity
6.0 Å	(50)
3.74 Å	(80)
3.69 Å	(80)
2.98 Å	(100)
1.783 Å	(50)
1.744 Å	(60)
1.732 Å	(70)
1.456 Å	(50)

Geological EnvironmentHide

Paragenetic Mode(s):

Paragenetic Mode	Earliest Age (Ga)
Stage 4b: Highly evolved igneous rocks	>3.0
34 : Complex granite pegmatites

Type Occurrence of KoragoiteHide

Type Locality:

ⓘ Vez-Dara River Valley, Shakhdara Range, Shughnon, Gorno-Badakhshan, Tajikistan

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:

Granite pegmatites

Associated Minerals at Type Locality:

Zircon

Stibiocolumbite

Pyrochlore Group

Columbite-(Fe)-Columbite-(Mn) Series

Ixiolite-(Mn2+)-Ixiolite-(Fe2+) Series

Reference:

Synonyms of KoragoiteHide

IMA1994-049

Karagoite

Other Language Names for KoragoiteHide

German:Koragoit

Russian:Корагоит

Spanish:Koragoita

Common AssociatesHide

Associated Minerals Based on Photo Data:

1 photo of Koragoite associated with Cassiterite

SnO₂

Related Minerals - Strunz-mindat Grouping Hide

4.DE.	Ziroite	ZrO₂	Tet. 4/mmm (4/m 2/m 2/m) : P4₂/nmc
4.DE.	Pertoldite	GeO₂	Trig. 3 2
4.DE.	Colchesterite	Bi³⁺₂Mo⁶⁺₂O₉	Mon. 2/m
4.DE.05	Downeyite	SeO₂	Tet. 4/mmm (4/m 2/m 2/m) : P4₂/mbc
4.DE.15	Koechlinite	Bi₂MoO₆	Orth. mm2 : Pna2₁
4.DE.15	Russellite	Bi₂WO₆	Orth. mm2 : Pca2₁
4.DE.15	Tungstibite	Sb³⁺₂WO₆	Orth. 2 2 2
4.DE.20	Tellurite	TeO₂	Orth. mmm (2/m 2/m 2/m) : Pbca
4.DE.25	Paratellurite	TeO₂	Tet. 4 2 2
4.DE.30	Bismutotantalite	Bi(Ta,Nb)O₄	Orth.
4.DE.30	Bismutocolumbite	Bi(Nb,Ta)O₄	Orth. mmm (2/m 2/m 2/m)
4.DE.30	Cervantite	Sb³⁺Sb⁵⁺O₄	Orth. mm2
4.DE.30	Stibiotantalite	Sb(Ta,Nb)O₄	Orth. mm2
4.DE.30	Stibiocolumbite	Sb(Nb,Ta)O₄	Orth. mm2
4.DE.30	Clinocervantite	Sb³⁺Sb⁵⁺O₄	Mon. 2/m : B2/b
4.DE.35	Baddeleyite	ZrO₂	Mon. 2/m : P2₁/b
4.DE.40	Billwiseite	Sb³⁺₅Nb₃WO₁₈	Mon. 2/m : B2/m
4.DE.45	Kyawthuite	Bi³⁺Sb⁵⁺O₄	Mon. 2/m

Fluorescence of KoragoiteHide

In UV light:

None

Other InformationHide

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

mindat.org URL:

https://www.mindat.org/min-7140.html
Please feel free to link to this page.

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External Links:

Look for Koragoite on Webmineral

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Raman and XRD data at RRUFF project

References and PDF downloads at RRUFF project

American Mineralogist Crystal Structure Database

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References for KoragoiteHide

Reference List:

Transactions of the Russian Academy of Sciences/Earth Science Sections: 353A(3): 341-343.

Mineralogical Record: 29: 473.

Yamnova, N.A., Pushcharovskii, D.Y., Voloshin, A.V. (1995) Crystal structure of a new natural Mn, W-tantaloniobate. Kristallografiya: 40: 469-475.

Jambor, John L., Pertsev, Nikolai N., Roberts, Andrew C. (1996) New mineral names. American Mineralogist, 81. 249-254 p.250

Jambor, John L., Grew, Edward S., Roberts, Andrew C. (1998) New mineral names. American Mineralogist, 83. 185-189

Localities for KoragoiteHide

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

- 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.


France
Nouvelle-Aquitaine Corrèze Ussel Meymac ⓘ La Grange Mine	Ansermet et al. (2010)

Tajikistan (TL)
Gorno-Badakhshan Shughnon Shakhdara Range ⓘ Vez-Dara River Valley (TL)	Voloshin et al. (1997) +1 other reference

Koragoite

About KoragoiteHide

Unique IdentifiersHide

IMA Classification of KoragoiteHide

Classification of KoragoiteHide

Mineral SymbolsHide

Physical Properties of KoragoiteHide

Optical Data of KoragoiteHide

Chemistry of KoragoiteHide

Crystallography of KoragoiteHide

Crystal StructureHide

X-Ray Powder DiffractionHide

Geological EnvironmentHide

Type Occurrence of KoragoiteHide

Synonyms of KoragoiteHide

Other Language Names for KoragoiteHide

Common AssociatesHide

Related Minerals - Strunz-mindat GroupingHide

Fluorescence of KoragoiteHide

Other InformationHide

Internet Links for KoragoiteHide

References for KoragoiteHide

Localities for KoragoiteHide

Locality ListHide

Related Minerals - Strunz-mindat Grouping Hide