Usovite
A valid IMA mineral species
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About Usovite
Formula:
Ba2CaMgAl2F14
Colour:
Brown to dark brown
Lustre:
Vitreous, Greasy
Hardness:
3½
Specific Gravity:
4.26 (Calculated)
Crystal System:
Monoclinic
Name:
Named by A.D. Nozhkin, V.A. Gavrilenko, and V.A. Moleva in 1967 in honor of Mikhail Antonovich Usov (20 February 1883, Kainsk (now Kuybyshev), Tomsk Governorate, Russia - 26 July 1939, Belokurikha, Altai Krai, Russia), Director, All-Union Scientific Research Institute of Geology, Russia.
Compare other Ba-Al fluoride minerals, 'Unnamed (Ba-Al Fluoride Hydroxide)' and 'Unnamed (Ba-analogue of calcioaravaipaite)'.
Unique Identifiers
Mindat ID:
4121
Long-form identifier:
mindat:1:1:4121:4
GUID
(UUID V4):
(UUID V4):
bec4dc2d-4f45-498c-8202-9decdfa3ecbe
IMA Classification of Usovite
Approved
Approval year:
1966
First published:
1967
Classification of Usovite
3.CB.35
3 : HALIDES
C : Complex halides
B : Neso-aluminofluorides
3 : HALIDES
C : Complex halides
B : Neso-aluminofluorides
11.6.14.1
11 : HALIDE COMPLEXES
6 : Aluminofluorides - Isolated Octahedra
11 : HALIDE COMPLEXES
6 : Aluminofluorides - Isolated Octahedra
8.4.17
8 : Halides - Fluorides, Chlorides, Bromides and Iodides; also Fluoborates and Fluosilicates
4 : Halides of the alkaline earths and Mg
8 : Halides - Fluorides, Chlorides, Bromides and Iodides; also Fluoborates and Fluosilicates
4 : Halides of the alkaline earths and Mg
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Symbol | Source | Reference |
---|---|---|
Usv | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Usovite
Vitreous, Greasy
Transparency:
Translucent, Opaque
Colour:
Brown to dark brown
Streak:
White
Hardness:
3½ on Mohs scale
Hardness:
VHN100=294 - Vickers
Cleavage:
Perfect
One direction, perfect; another at 44 degrees to the first noted
One direction, perfect; another at 44 degrees to the first noted
Fracture:
Irregular/Uneven
Density:
4.26 g/cm3 (Calculated)
Optical Data of Usovite
Type:
Biaxial (+)
RI values:
nα = 1.441(1) nβ = 1.442(1) nγ = 1.444(1)
2V:
Measured: 70° , Calculated: 72°
Max Birefringence:
δ = 0.003
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
dispersion not observed
Pleochroism:
Weak
Comments:
X = Y = brownish yellow; Z = pale yellow.
Chemistry of Usovite
Mindat Formula:
Ba2CaMgAl2F14
Crystallography of Usovite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/b
Setting:
C2/c
Cell Parameters:
a = 13.565(1) Å, b = 5.200(4) Å, c = 14.557(10) Å
β = 91.35°
β = 91.35°
Ratio:
a:b:c = 2.609 : 1 : 2.799
Unit Cell V:
1,026.54 ų (Calculated from Unit Cell)
Z:
4
Crystal Structure
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2x2x2 | 3x3x3 | 4x4x4
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
---|---|---|---|---|---|---|---|
0012515 | Usovite | Litvin A L, Petrunina A A, Ostapenko S S (1980) Crystal structure of usovite Dopovidi Akademii Nauk Ukrainskoi RSR Seriya B-Geologichni Khimichni Ta Biologichni Nauki 3 47-80 | 1980 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
3.41 Å | (10) |
1.205 Å | (9) |
1.025 Å | (9) |
1.132 Å | (8) |
1.093 Å | (8) |
1.012 Å | (8) |
1.005 Å | (8) |
Geological Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
Near-surface Processes | |
23 : Subaerial aqueous alteration by non-redox-sensitive fluids (see also #47) | |
Stage 7: Great Oxidation Event | <2.4 |
45b : [Other oxidized fumarolic minerals] |
Type Occurrence of Usovite
Place of Conservation of Type Material:
Tomsk Polytechnic Institute, Tomsk; Central Siberian Geological Museum, Novosibirsk, VI-15/1; Mining Institute, St. Petersburg, 1089/1; A.E. Fersman Mineralogical Museum, Academy of Sciences, Moscow, Russia, 69852, 76161, vis1194.
Associated Minerals at Type Locality:
Reference:
Nozhkin, A.D., Gavrilenko, V.A., Moleva, V.A. (1967) Usovite, a new barium fluoaluminate. Zapiski Vsesoyuznogo (Vserossiyskogo) Mineralogicheskogo Obshchestva: 96: 63-66.
Synonyms of Usovite
Other Language Names for Usovite
Common Associates
Associated Minerals Based on Photo Data:
Related Minerals - Strunz-mindat Grouping
3.CB.05 | Cryolithionite | Na3Al2(LiF4)3 |
3.CB.15 | Cryolite | Na2NaAlF6 |
3.CB.15 | Elpasolite | K2NaAlF6 |
3.CB.15 | Simmonsite | Na2LiAlF6 |
3.CB.20 | Colquiriite | CaLi[AlF6] |
3.CB.25 | Weberite | Na2Mg[AlF6]F |
3.CB.25 | Leonardsenite | MgAlF5 · 2H2O |
3.CB.30 | Karasugite | SrCa[Al(F,OH)7] |
3.CB.40 | Pachnolite | NaCa[AlF6] · H2O |
3.CB.40 | Thomsenolite | NaCa[AlF6] · H2O |
3.CB.45 | Carlhintzeite | Ca2[AlF6]F · H2O |
3.CB.50 | Yaroslavite | Ca3Al2F10(OH)2 · H2O |
3.CB.55 | Sbacchiite | Ca2AlF7 |
3.CB.60 | Verneite | Na2Ca3Al2F14 |
Other Information
Magnetism:
Diamagnetic
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Usovite
mindat.org URL:
https://www.mindat.org/min-4121.html
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Please feel free to link to this page.
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References for Usovite
Reference List:
Localities for Usovite
Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
Struck out - Mineral was erroneously reported from this locality.
Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
All localities listed without proper references should be considered as questionable.
Germany | |
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Italy | |
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Russia (TL) | |
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Clara Mine, Oberwolfach, Ortenaukreis, Freiburg Region, Baden-Württemberg, Germany