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General Fedorovskite Information |
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 Chemical Formula: |
Ca2(Mg,Mn)2B4O7(OH)6 | ||
| Composition: |
Molecular Weight = 401.36 gm | ||
| Calcium 19.97 % Ca 27.94 % CaO | |||
| Magnesium 9.08 % Mg 15.06 % MgO | |||
| Manganese 6.84 % Mn 8.84 % MnO | |||
| Boron 10.77 % B 34.69 % B2O3 | |||
| Hydrogen 1.51 % H 13.47 % H2O | |||
| Oxygen 51.82 % O | |||
| ______ ______ | |||
| 100.00 % 100.00 % = TOTAL OXIDE | |||
| Empirical Formula: |
Ca2Mg1.5Mn2+0.5B4O7(OH)6 | ||
| Environment: |
Veinlets in a skarn-type boron deposit. Forms a series with roweite. | ||
| IMA Status: |
Approved IMA 1976 | ||
| Locality: |
Solongo boron deposit, Buryatia, Transbaikal region, Russia. Link to MinDat.org Location Data. | ||
| Name Origin: |
Named for Nikolai Mikhailovich Fedorovskii (1886-1956), eminent crystallographer and founder of the Russian Research Institute of Mineral Resources, Moscow, Russia. | ||
| Name Pronunciation: |
Fedorovskite + Pronunciation  |
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Fedorovskite Image | |||
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Images:
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Fedorovskite Crystallography |
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| Axial Ratios: |
a:b:c =0.6813:1:0.6197 | ||
| Cell Dimensions: |
a = 8.96, b = 13.15, c = 8.15, Z = 4; V = 960.27 Den(Calc)= 2.78 | ||
| Crystal System: |
Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pbam | ||
| X Ray Diffraction: |
By Intensity(I/Io): 2.59(1), 3.92(1), 3.02(0.7), | ||
Physical Properties of Fedorovskite |
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| Cleavage: |
{100} Perfect | ||
| Color: |
Brown. | ||
| Density: |
2.65 | ||
| Diaphaneity: |
Transparent | ||
| Hardness: |
4.5 - Between Fluorite and Apatite | ||
| Streak: |
brownish | ||
Optical Properties of Fedorovskite |
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| Gladstone-Dale: |
CI meas= -0.041 (Good) - where the CI = (1-KPDmeas/KC) CI calc= 0.008 (Superior) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.2248,KPDmeas= 0.2358,KC= 0.2266 Ncalc = 1.6 - 1.63 |
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| Optical Data: |
Biaxial (-), a=1.619, b=1.627, g=1.629, bire=0.0100, 2V(Calc)=52, 2V(Meas)=48. | ||
Calculated Properties of Fedorovskite |
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| Electron Density: |
Bulk Density (Electron Density)=2.78 gm/cc note: Specific Gravity of Fedorovskite =2.78 gm/cc. |
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| Fermion Index: |
Fermion Index = 0.03 Boson Index = 0.97 |
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| Photoelectric: |
PEFedorovskite = 4.50 barns/electron U=PEFedorovskite x rElectron Density= 12.50 barns/cc. |
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Fedorovskite is Not Radioactive |
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Fedorovskite Classification |
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| Dana Class: |
25.04.01.02 (25)Anhydrous Borates Containing Hydroxyl or Halogen | ||
| (25.04)Dana Type | |||
| (25.04.01)Dana Group | |||
| Strunz Class: |
06.DA.25 06 - BORATES | ||
| 06.D - Tetraborates | |||
| 06.DA -Neso-tetraborates | |||
Other Fedorovskite Information |
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| References: |
NAME( AntBidBlaNic5) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990) | ||
| See Also: |
Links to other databases for Fedorovskite : 1 - Am. Min. Crystal Structure Database 2 - Athena 3 - EUROmin Project 4 - Ecole des Mines de Paris 5 - GeoScienceWorld 6 - Google Images 7 - Google Scholar 8 - Handbook of Mineralogy (MinSocAm) 9 - Handbook of Mineralogy (UofA) 10 - MinDAT 11 - Mineralienatlas (Deutsch) 12 - Online Mineral Museum 13 - QUT Mineral Atlas 14 - Ruff.Info Search for Fedorovskite using: Visit our Advertisers for Fedorovskite : A Bijoux Google Search for FedorovskiteAdam's Minerals Google Search for Fedorovskite Cape Minerals Google Search for Fedorovskite Dakota Matrix Minerals Google Search for Fedorovskite Excalibur Mineral Corp. Google Search for Fedorovskite Exceptional Minerals Google Search for Fedorovskite John Betts Fine Minerals Search for Fedorovskite McDougall Minerals Google Search for Fedorovskite Mineral News Website Link Rock and Mineral Shows Google Search for Fedorovskite Weinrich Minerals, Inc. Google Search for Fedorovskite Ask about Fedorovskite here : Print or Cut-and-Paste your Fedorovskite Specimen Label here :
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