Montebrasite

Montebrasite with Albite Telirio claim, Linopolis, Divino das Laranjeiras, Doce valley, Minas Gerais, Brazil Size: 2.0 x 2.0 x 1.3 cm (thumbnail) © danweinrich

Chemical Formula: LiAl(PO4)(OH)
Locality: Montebras, Creuse, France.
Name Origin: Named for the locality in 1872.

History

Discovery date: 1871
Town of Origin : MONTEBRAS, SOUMANS, CREUSE
Country of Origin : FRANCE

Optical properties

Optical and misc. Properties : Transparent to Translucent
Refractive Index: from 1,57 to 1,62
Axial angle 2V: 81°30′

Physical Properties

Cleavage: {100} Perfect, {110} Good, {011} Distinct
Color:     Bluish, Colorless, Greenish, Greenish gray, Gray white.
Density: 3.027
Diaphaneity: Transparent to Translucent
Fracture: Brittle – Conchoidal – Very brittle fracture producing small, conchoidal fragments.
Hardness: 5.5-6 – Knife Blade-Orthoclase
Luster: Vitreous – Greasy
Streak: white

Photos :

Montebrasite 6.5×3.8×1.2 cm Fazenda Pomeroli, Linopolis District Divino das Laranjeiras, Minas Gerais Brazil Copyright © David K. Joyce Minerals
Montebrasite 6.2×2.2×0.7 cm Fazenda Pomeroli, Linopolis District Divino das Laranjeiras, Minas Gerais Brazil Copyright © David K. Joyce Minerals
Montebrasite Minas Gerais, Brazil Thumbnail, 12.9 mm x 7.7 mm ; 2.92 cts © irocks
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