Mineralogy Database

Fedorovskite Mineral Data

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General Fedorovskite Information

Help on Chemical  Formula: Chemical Formula: Ca2(Mg,Mn)2B4O7(OH)6
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Ca2Mg1.5Mn2+0.5B4O7(OH)6
Help on Environment: Environment: Veinlets in a skarn-type boron deposit. Forms a series with roweite.
Help on IMA Status: IMA Status: Approved IMA 1976
Help on Locality: Locality: Solongo boron deposit, Buryatia, Transbaikal region, Russia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Nikolai Mikhailovich Fedorovskii (1886-1956), eminent crystallographer and founder of the Russian Research Institute of Mineral Resources, Moscow, Russia.
Help on Name Pronunciation: Name Pronunciation: Fedorovskite + Pronunciation Say FEDOROVSKITE

Fedorovskite Image

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Comments: Brown crystalline fedorovskite.
Location: Solongo, Republic of Buryatia, Siberia, Russia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Fedorovskite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.6813:1:0.6197
Help on Cell Dimensions: Cell Dimensions: a = 8.96, b = 13.15, c = 8.15, Z = 4; V = 960.27 Den(Calc)= 2.78
Help on Crystal System: Crystal System: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: Pbam
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.59(1), 3.92(1), 3.02(0.7),

Physical Properties of Fedorovskite

Help on Cleavage: Cleavage: {100} Perfect
Help on Color: Color: Brown.
Help on Density: Density: 2.65
Help on Diaphaneity: Diaphaneity: Transparent
Help on Hardness: Hardness: 4.5 - Between Fluorite and Apatite
Help on Streak: Streak: brownish

Optical Properties of Fedorovskite

Help on Gladstone-Dale: 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
Help on Optical Data: 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

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.78 gm/cc
note: Specific Gravity of Fedorovskite =2.78 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.03
Boson Index = 0.97
Help on Photoelectric: Photoelectric: PEFedorovskite = 4.50 barns/electron
U=PEFedorovskite x rElectron Density= 12.50 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Fedorovskite is Not Radioactive

Fedorovskite Classification

Help on  Dana Class: Dana Class: (25)Anhydrous Borates Containing Hydroxyl or Halogen
  (25.04)Dana Type
  (25.04.01)Dana Group Roweite Ca2Mn2B4O7(OH)6 Pbam 2/m 2/m 2/m Fedorovskite Ca2(Mg,Mn)2B4O7(OH)6 Pbam 2/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 06.DA.25 06 - BORATES
  06.D - Tetraborates
  06.DA -Neso-tetraborates
06.DA.25 Fedorovskite Ca2(Mg,Mn)2B4O7(OH)6 Pbam 2/m 2/m 2/m
06.DA.25 Roweite Ca2Mn2B4O7(OH)6 Pbam 2/m 2/m 2/m

Other Fedorovskite Information

Help on References: References: NAME( AntBidBlaNic5) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: 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

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Dana No: Strunz No: 06.DA.25





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