Usovite Mineral Data

Usovite Mineral Data +

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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.

Synonym:

ICSD 20393

PDF 19-1391

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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:

MonoclinicSpace 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

Diaphaniety:

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

Gladstone-Dale:

CI meas= 0.248 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.262 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1038,KPDmeas= 0.1058,KC= 0.1407

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:

r_electron=3.76 gm/cc
note: r_Usovite=4.18 gm/cc.

Fermion Index

Fermion Index = 0.07805
Boson Index = 0.92195

Photoelectric:

PE_Usovite= 187.34 barns/electron
U=PE_Usovite x r_electron= 703.47 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Usovite is Not Radioactive

Usovite Classification

Dana Class:

11.6.14.1 (11)Halide Complexes; Alumino-fluorides

(11.6)with miscellaneous formulae

(11.6.14)Dana Group

11.6.14.1 Usovite Ba2CaMgAl2F14 C 2/c or Cc Mono

Strunz Class:

III/C.03-40 III - Halogenides

III/C - Double halogenides with water, Fluorides

III/C.03 - Prosopite - Boldyrevite series

III/C.03-10 Prosopite CaAL2(F,OH)8 A2/a 2/m

III/C.03-20 Chiolite Na5Al3F14 P 4/mnc 4/m 2/m 2/m

III/C.03-30 Weberite Na2MgAlF7 I mma 2/m 2/m 2/m

III/C.03-40 Usovite Ba2CaMgAl2F14 C 2/c or Cc Mono

III/C.03-45 Karasugite SrCaAl(F,OH)7 P 2₁/c 2/m

III/C.03-50 Carlhintzeite Ca2AlF7·(H2O) C1,C1 Tri

III/C.03-55 Rosenbergite AlF3·3(H2O) P 4/n 4/m

III/C.03-60 Ralstonite NaxMgxAl2-x(F,OH)6·(H2O) F d3m 4/m 3 2/m

III/C.03-70 Neighborite NaMgF3 Pcmn 2/m 2/m 2/m

III/C.03-80 Boldyrevite* NaCaMgAl3F14·4(H2O) None

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 -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 Usovite Specimen Label here :

Usovite

Ba2CaMgAl2F14
Dana No: 11.6.14.1 Strunz No: III/C.03-40
Locality:

Notes: