General Koragoite Information![]() (Mn++,Fe+++)3(Nb,Ta,Ti)2(Nb,Mn)2(W,Ta)2O20 |
![]() Molecular Weight = 1,241.59 gm |
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Tantalum 16.03 % Ta 19.57 % Ta2O5 |
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Titanium 1.16 % Ti 1.93 % TiO2 |
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Manganese 13.50 % Mn 12.86 % MnO / 5.09 % Mn2O3 |
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Niobium 17.96 % Nb 25.69 % Nb2O5 |
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Iron 3.37 % Fe 4.82 % Fe2O3 |
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Tungsten 22.21 % W 28.01 % WO3 |
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Oxygen 25.77 % O |
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100.00 % 97.97 % = TOTAL OXIDE |
![]() Mn2+2.25Fe3+0.75Nb1.2Ta0.6Ti0.3Nb1.2Mn3+0.8W1.5Ta0.5O20 |
![]() In granitic pegmatites. |
![]() Approved IMA 1995 |
![]() Vez-Dara River valley, Shakhdara Range, in the southwestern Pamir Mountains, Tajikistan. Link to MinDat.org Location Data. |
![]() Named after Aleksei Aleksandrovich Korago (1942–1993), geologist who investigated the formation of river pearls in the Arkhangel'sk district of Russia, and the origin of amber. |
![]() Koragoite + Pronunciation |
![]() ![]() IMA1994-049 |
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Koragoite Crystallography![]() a:b:c =4.8912:1:1.1392 |
![]() a = 24.73, b = 5.056, c = 5.76, Z = 2; beta = 103.5° V = 700.30 Den(Calc)= 5.89 |
![]() Monoclinic - SphenoidalH-M Symbol (2) Space Group: P 21 |
![]() By Intensity(I/Io): 2.98(1), 3.69(0.8), 3.74(0.8), |
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| Physical Properties of Koragoite![]() None |
![]() Red, Brownish red. |
![]() 4.7 - 6.22, Average = 5.46 |
![]() Opaque |
![]() Brittle - Uneven - Very brittle fracture producing uneven fragments. |
![]() Platy - Sheet forms (e.g. micas). |
![]() 4-5 - Fluorite-Apatite |
![]() Metallic |
![]() grayish brown |
| Optical Properties of Koragoite![]() NCalc= 2.24 - from Gladstone-Dale relationship (KC = 0.2097) where Ncalc=Dcalc*KC+1 |
NCalc= 2.15 - from Gladstone-Dale relationship (KC = 0.2097) where Ncalc=Dmeas*KC+1 ![]() Weak. |
![]() Weak. |
![]() Light gray. |
![]() None. |
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| Calculated Properties of Koragoite![]() Bulk Density (Electron Density)=5.24 gm/cc |
note: Specific Gravity of Koragoite =5.89 gm/cc. ![]() Fermion Index = 0.03 |
Boson Index = 0.97 ![]() PEKoragoite = 488.76 barns/electron |
U=PEKoragoite x rElectron Density=2,560.01 barns/cc. ![]() GRapi = 0 (Gamma Ray American Petroleum Institute Units) |
Koragoite is Not Radioactive | Koragoite Classification![]() 08.07.12.01 (08)Multiple Oxides with Nb, Ta, and Ti |
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(08.07)Dana Type |
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(08.07.12)Dana Group |
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![]() 04.DE.10 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate |
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04.D - Metal:Oxygen = 1:2 and similar |
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04.DE -With medium-sized cations; with various polyhedra |
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| Other Koragoite Information![]() NAME( MinRec) PHYS. PROP.(Am.Min.,Vol.81,1996) OPTIC PROP.(MinRec, v 29, p 473) |
![]() Links to other databases for Koragoite : |
1 - Am. Min. Crystal Structure Database 2 - Athena 3 - GeoScienceWorld 4 - Google Images 5 - Google Scholar 6 - Handbook of Mineralogy (UofA) 7 - MinDAT 8 - Mineralienatlas (Deutsch) 9 - Online Mineral Museum 10 - QUT Mineral Atlas 11 - Ruff.Info 12 - WWW-MINCRYST Search for Koragoite using: Visit our Advertisers for Koragoite : A Bijoux Google Search for KoragoiteAdam's Minerals Google Search for Koragoite Cape Minerals Google Search for Koragoite Dakota Matrix Minerals Google Search for Koragoite Excalibur Mineral Corp. Google Search for Koragoite Exceptional Minerals Google Search for Koragoite John Betts Fine Minerals Search for Koragoite McDougall Minerals Google Search for Koragoite Mineral News Website Link Rock and Mineral Shows Google Search for Koragoite Weinrich Minerals, Inc. Google Search for Koragoite Ask about Koragoite here : Print or Cut-and-Paste your Koragoite Specimen Label here :
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