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Montebrasite

Montebrasite

MNHN N°206.81

visu_46 infos
FROM : Genipapo district, Itinga, Minas Gerais, Brazil
SIZE : 9 x 7 cm

general description

This sample shows a well-formed translucent crystal of ligth yellow montebrasite on albite. One observes some orange brown crystals of kosnarite on the albite. This sample measures 9 x 7 cm, kosnarite crystals are millimétric.

This montebrasite comes from Genipapo district, in Minas Gerais, Brazil. The Muséum national d’Histoire naturelle could obtain this specimen thanks to support from Total. It is kept in the storage rooms of the collections (i.e., not yet displayed to the public).

Photography: Louis-Dominique Bayle, © MNHN.
The Species page
Identity card
SPECIE : Montebrasite

HISTORY : Named to recall its type-locality: Montebras, Creuse, France

Species first described in 1871 by Alfred Descloizeaux (1817-1897), French mineralogist and cristallographer

Type-locality: Mine Montebras, Creuse, France

CHEMICAL FORMULA : LiAlPO4OH
CRYSTAL SYSTEM : Triclinic
COLOR : Colourless, white, yellow pale, pale pinky-violett
DIAPHANIETY : Translucent to transparent
LUSTER : Vitreous to pearly
STREAK : White
MORPHOLOGY : Prismatic crystals, isometric, massive
HARDNESS : 5,5-6,0
DENSITY : 3,03

CHEMICAL CLASS : VII - Phosphates, arsenat
GROUP : Amblygonite
STRUNZ CLASS BEFORE 2001 : 7/B.02-40
STRUNZ CLASS AFTER 2001 : 8.BB.05
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