Fedorovskite Mineral Data

General Fedorovskite Information

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:

Ca₂Mg_1.5Mn²⁺_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

Fedorovskite Image

Images:

Fedorovskite

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

Fedorovskite Crystallography

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

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.59(1), 3.92(1), 3.02(0.7),

Physical Properties of Fedorovskite

Cleavage:

{100} Perfect

Color:

Brown.

Density:

2.65

Diaphaneity:

Transparent

Hardness:

4.5 - Between Fluorite and Apatite

Streak:

brownish

Optical Properties of Fedorovskite

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

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

Electron Density:

Bulk Density (Electron Density)=2.78 gm/cc
note: Specific Gravity of Fedorovskite =2.78 gm/cc.

Fermion Index:

Fermion Index = 0.03
Boson Index = 0.97

Photoelectric:

PE_Fedorovskite= 4.50 barns/electron
U=PE_Fedorovskite x rElectron Density= 12.50 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Fedorovskite is Not Radioactive

Fedorovskite Classification

Dana Class:

25.04.01.02 (25)Anhydrous Borates Containing Hydroxyl or Halogen

(25.04)Dana Type

(25.04.01)Dana Group

25.04.01.01 Roweite Ca2Mn2B4O7(OH)6 Pbam 2/m 2/m 2/m

25.04.01.02 Fedorovskite Ca2(Mg,Mn)2B4O7(OH)6 Pbam 2/m 2/m 2/m

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

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

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Print or Cut-and-Paste your Fedorovskite Specimen Label here :

Fedorovskite

Ca2(Mg,Mn)2B4O7(OH)6
Dana No: 25.04.01.02 Strunz No: 06.DA.25
Locality:

Notes: