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Andorite

MNHN N°202.124

visu_586 infos

FROM : Veine San Isidro, niveau 340, mine San José, Oruro, Bolivia
SIZE : 6 x 2.5 cm

general description

This crystal of andorite is the biggest specimen known for this species. It is composed by andorite crystals (lenght of 6 cm and 2-3cm large) covered on some spots by bouquets of zinkenite crystals.

The tabular crystals of andorite have bright facets sometimes iridescent. This specimen comes from the deposit mineral of San Isidro, level 340, in San José Mine, Oruro in Bolivia. It is a recent discovery (August 2003) that occured when the Bolivian diggers went back to the mine.

Acquired thanks to support from Total, it is today kept in the storage rooms of the collections (i.e., not yet displayed to the public) of the Muséum national d’Histoire naturelle.

Photography: Louis-Dominique Bayle, © MNHN.

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The Species page

Identity card

SPECIE : Andorite

HISTORY : Species dedicated to Andor von Semsey (1833-1923), who funded the Termeszettudomanyi Muzeum

Species first described in 1892 by Joseph A. Krenner (1839-1920), Hungarian mineralogist

Type-locality: Baia Sprie (Felsöbánya), Monts Gutâi, Maramures, Romania

CHEMICAL FORMULA : Pb Ag Sb 3S 6
CRYSTAL SYSTEM : Orthorhombic
COLOR : Gris très sombre, noir
DIAPHANIETY : Opaque
LUSTER : Metallic
STREAK : Black
MORPHOLOGY : Prismatic crystals, striated, massive
HARDNESS : 3,0-3,5
DENSITY : 5,4

CHEMICAL CLASS : II - Sulfides, arsenides
GROUP : Lillianite
STRUNZ CLASS BEFORE 2001 : 2/E.23-40
STRUNZ CLASS AFTER 2001 : 2.JA.20

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