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Koragoite
A valid IMA mineral species
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About Koragoite
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.
This page provides mineralogical data about Koragoite.
Unique Identifiers
Mindat ID:
7140
Long-form identifier:
mindat:1:1:7140:2
IMA Classification of Koragoite
Approved
IMA Formula:
Mn2+2Mn3+Nb5+2(Nb5+,Ta5+)3W6+2O20
Approval year:
1994
First published:
1997
Classification of Koragoite
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
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
8 : MULTIPLE OXIDES CONTAINING NIOBIUM,TANTALUM OR TITANIUM
7 : Miscellaneous
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| 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 Koragoite
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 Koragoite
Anisotropism:
Distinct
Colour in reflected light:
Gray
Internal Reflections:
Red
Chemistry of Koragoite
Mindat Formula:
(Mn2+,Fe3+)3(Nb,Ta,Ti)2(Nb,Mn)2(W,Ta)2O20
Element Weights:
Crystallography of Koragoite
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°
β = 103.5°
Ratio:
a:b:c = 4.891 : 1 : 1.139
Unit Cell V:
700.30 ų (Calculated from Unit Cell)
Crystal Structure
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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
X-Ray Powder Diffraction
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 Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 4b: Highly evolved igneous rocks | >3.0 |
| 34 : Complex granite pegmatites |
Type Occurrence of Koragoite
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:
Synonyms of Koragoite
Other Language Names for Koragoite
Common Associates
Associations Based on Photo Data:
| 1 photo of Koragoite associated with Cassiterite | SnO2 |
Related Minerals - Strunz-mindat Grouping
| 4.DE. | Colchesterite | Bi3+2Mo6+2O9 |
| 4.DE. | Pertoldite | GeO2 |
| 4.DE. | Ziroite | ZrO2 |
| 4.DE.05 | Downeyite | SeO2 |
| 4.DE.15 | Russellite | Bi2WO6 |
| 4.DE.15 | Koechlinite | Bi2MoO6 |
| 4.DE.15 | Tungstibite | Sb3+2WO6 |
| 4.DE.20 | Tellurite | TeO2 |
| 4.DE.25 | Paratellurite | TeO2 |
| 4.DE.30 | Bismutotantalite | BiTaO4 |
| 4.DE.30 | Stibiotantalite | Sb3+TaO4 |
| 4.DE.30 | Cervantite | Sb3+Sb5+O4 |
| 4.DE.30 | Bismutocolumbite | BiNbO4 |
| 4.DE.30 | Stibiocolumbite | SbNbO4 |
| 4.DE.30 | Clinocervantite | Sb3+Sb5+O4 |
| 4.DE.35 | Baddeleyite | ZrO2 |
| 4.DE.40 | Billwiseite | Sb3+5Nb3WO18 |
| 4.DE.45 | Kyawthuite | Bi3+Sb5+O4 |
Fluorescence of Koragoite
None
Other Information
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 Koragoite
mindat.org URL:
https://www.mindat.org/min-7140.html
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References for Koragoite
Localities for Koragoite
Showing 2 localities.
symbol to view information about a locality.
The Locality List
- 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).
All localities listed without proper references should be considered as questionable.
France | |
| Ansermet et al. (2010) |
Tajikistan (TL) | |
| Voloshin et al. (1997) +1 other reference |
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Vez-Dara River Valley, Shakhdara Range, Shughnon, Gorno-Badakhshan, Tajikistan