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Danburite

MNHN N°203.210

visu_593 infos

FROM : Aurora mines, Charcas, San Luis state, Potosi, Mexico
SIZE : 20 x 19.5 x 23 cm

general description

Here is a bouquet of danburite crystals. Crystals are mostly well-formed and show a peaked termination. They are of a very pale pink color. The whole sample measures not less than 20 x 19.5 x 23 cm!

This specimen, acquired thanks to support from Total, comes from Aurora mines in Mexico. It is kept in the storage rooms of the collections (i.e., not yet displayed to the public).

Photography: A. Dahmane / Photo Saint-Hilaire,
© MNHN.

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The Species page

Identity card

SPECIE : Danburite

HISTORY : Named after its type-locality : Danbury

Species described in 1839 by Charles Upham Shepard (1804-1886), American chemist and mineralogist

Type-locality: Danbury, Fairfield, Connecticut, USA

CHEMICAL FORMULA : CaB2 (SiO4)2
CRYSTAL SYSTEM : Orthorhombic
COLOR : Colorless, white, yellow, yellowish brown, greenish
DIAPHANIETY : Transparent to translucent
LUSTER : Vitreous to greasy
STREAK : White
MORPHOLOGY : Prismatic crystals
HARDNESS : 7,0-7,25
DENSITY : 2,99

CHEMICAL CLASS : VIII - Silicates
GROUP : Danburite
STRUNZ CLASS BEFORE 2001 : 8/J.08-20
STRUNZ CLASS AFTER 2001 : 9.FA.65

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