Usovite Mineral Data

General Usovite Information

Chemical Formula:

Ba2CaMgAl2F14

Composition:

Molecular Weight = 658.98 gm

Barium 41.68 % Ba 46.53 % BaO

Calcium 6.08 % Ca 8.51 % CaO

Magnesium 3.69 % Mg 6.12 % MgO

Aluminum 8.19 % Al 15.47 % Al₂O₃

Fluorine 40.36 % F 40.36 % F

- % F -17.00 % -O=F₂

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ba₂CaMgAl₂F₁₄

Environment:

Fluorite veins.

IMA Status:

Approved IMA 1967

Locality:

Upper Noiby River area, Yenisei region, Siberia, Russia. Link to MinDat.org Location Data.

Name Origin:

Named for Mikhail Antonovich Usov (1883-1939), Russian geologist.

Name Pronunciation:

Usovite

Synonym:

ICSD 20393

PDF 19-1391

Usovite Image

Images:

Usovite

Comments: B&W BSE image of a fragment of usovite (Us) and fluorite (Fl) in an epoxy grain mount section.
Location: Pravaya Noiba River (tributary if the Teya), northeastern Enisei Range, Krasnoyarsk region, Russia. Scale: See Image.
© Diederik Visser

Usovite Crystallography

Axial Ratios:

a:b:c =2.6086:1:2.7994

Cell Dimensions:

a = 13.565, b = 5.2, c = 14.557, Z = 4; beta = 91.35° V = 1,026.54 Den(Calc)= 4.26

Crystal System:

Monoclinic Space Group: C 2/c or Cc

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

By Intensity(I/I_o): 3.41(1), 1.75(0.7), 2.04(0.7),

Physical Properties of Usovite

Cleavage:

{???} Perfect

Color:

Brown, Dark brown, Yellowish brown.

Density:

4.18

Diaphaneity:

Translucent to Opaque

Fracture:

Irregular - Flat surfaces (not cleavage) fractured in an irregular pattern.

Habit:

Granular - Generally occurs as anhedral to subhedral crystals in matrix.

Habit:

Platy - Sheet forms (e.g. micas).

Hardness:

3.5 - Copper Penny

Luster:

Vitreous - Greasy

Streak:

white

Optical Properties of Usovite

Optical Data:

Biaxial (+), a=1.441, b=1.442, g=1.444, bire=0.0030, 2V(Calc)=72, 2V(Meas)=70.

Pleochroism (x):

brownish yellow.

Pleochroism (y):

brownish yellow.

Pleochroism (z):

pale yellow.

Calculated Properties of Usovite

Electron Density:

Bulk Density (Electron Density)=3.83 gm/cc
note: Specific Gravity of Usovite =4.26 gm/cc.

Fermion Index:

Fermion Index = 0.07
Boson Index = 0.93

Photoelectric:

PE_Usovite= 187.34 barns/electron
U=PE_Usovite x rElectron Density= 716.94 barns/cc.

Radioactivity:

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

Usovite Classification

Dana Class:

11.06.14.01 (11)Halide Complexes; Alumino-fluorides

(11.06)with miscellaneous formulae

(11.06.14)Dana Group

11.06.14.01 Usovite Ba2CaMgAl2F14 C 2/c or Cc Mono

Strunz Class:

03.CB.35 03 - HALIDES

03.C - Complex Halides

03.CB -Neso-aluminofluorides

03.CB.35 Usovite Ba2CaMgAl2F14 C 2/c or Cc Mono

Other Usovite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)

See Also:

Links to other databases for Usovite :
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 Usovite Specimen Label here :

Usovite

Ba2CaMgAl2F14
Dana No: 11.06.14.01 Strunz No: 03.CB.35
Locality:

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