Fedorovskite Mineral Data

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

IMA Status:

Approved IMA 1976

Locality:

Link to MinDat.org Location Data.

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

Diaphaniety:

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

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:

r_electron=2.78 gm/cc
note: r_Fedorovskite=2.78 gm/cc.

Fermion Index

Fermion Index = 0.03104
Boson Index = 0.96896

Photoelectric:

PE_Fedorovskite= 4.50 barns/electron
U=PE_Fedorovskite x r_electron= 12.50 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Fedorovskite is Not Radioactive

Fedorovskite Classification

Dana Class:

25.4.1.2 (25)Anhydrous Borates Containing Hydroxyl or Halogen

(25.4)Dana Type

(25.4.1)Dana Group

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

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

Strunz Class:

V/H.11-10 V - Nitrates, Carbonates and Borates

V/H - Group borates. Planary and tetrahedral groups [B3O5]1- to [B6O10]2-

V/H.11 - Fedorovskite - Roweite series

V/H.11-10 Fedorovskite Ca2(Mg,Mn)2B4O7(OH)6 Pbam 2/m 2/m 2/m

V/H.11-20 Roweite Ca2Mn2B4O7(OH)6 Pbam 2/m 2/m 2/m

Other Fedorovskite Information

References:

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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 -École des Mines de Paris

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

Fedorovskite

Ca2(Mg,Mn)2B4O7(OH)6
Dana No: 25.4.1.2 Strunz No: V/H.11-10
Locality:

Notes: