Muséum national d'histoire naturelle _ The species

FROM : Brumado, Bahia, Brazil
SIZE : 5.3 x 5.5 cm

This crystal of uvite measures 5.5 x 5.3 cm, its termination shows clearly 120° angles. It has a dark green colour only.

This sample comes from Brumado in Brazil. Aquired thanks to support from Total, it is currently exposed in the Treasure Room, within the Gallery of Mineralogy of the Muséum national d’Histoire naturelle.

Photography: Louis-Dominique Bayle, © MNHN.

SPECIE : Uvite

HISTORY : Named to recall its type-locality: Uva province, Sweden

Species first described in 1929 by Wilhelm Kunitz (1894-1983), German mineralogist

Type-locality: Uva Province, Sri Lanka

CHEMICAL FORMULA : (Ca,Na)(Mg,Fe2+)3 Al5 Mg(BO3)3 Si6O18 (OH,F)4
CRYSTAL SYSTEM : Hexagonal
COLOR : Brown, light- to dark green, red, black, with colour zonations
DIAPHANIETY : Semi-transparent
LUSTER : Vitreous to resineous
STREAK : White, light green
MORPHOLOGY : Prismatic crystals, isometric, tabular
HARDNESS : 7,5
DENSITY : 3,08

CHEMICAL CLASS : VIII - Silicates
GROUP : Tourmaline
STRUNZ CLASS BEFORE 2001 : 8/E.19-90
STRUNZ CLASS AFTER 2001 : 9.CK.05

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Uvite

Uvite

MNHN N°195.198

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