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Aragonite

Aragonite

MNHN N°198.66

visu_466 infos
FROM : Sarrans dam, near Montezix , Aveyron, France
SIZE : 4,3 x 3 x 1,4 cm

general description

This aragonite shows prismatic crystals of gemmeous quality. They are associated to grayish spherules which could also be aragonite (Detail 1).

This specimen comes from the Sarrans dam, which is close to Montezix in Aveyron. This specimen was offered to the Museum national d’Histoire naturelle by Mr. Pierre-Jacques Chiappero. 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.
The Species page
Identity card
SPECIE : Aragonite

HISTORY : Named after its type-locality: Molina de Aragón, Spain

Species first described in 1796 by Abraham Gottlob Werner (1749-1817), German geologist

Type-locality: Molina de Aragón, Spain

CHEMICAL FORMULA : Ca CO3
CRYSTAL SYSTEM : Orthorhombic
COLOR : Colorless, white, gray, brown
DIAPHANIETY : Transparent to translucent
LUSTER : Vitreous
STREAK : White
MORPHOLOGY : Prismatic crystals, sometimes flattened, acicular
HARDNESS : 3,5-4,0
DENSITY : 2,93

CHEMICAL CLASS : V - Carbonates, nitrates
GROUP : Aragonite
STRUNZ CLASS BEFORE 2001 : 5/B.04-10
STRUNZ CLASS AFTER 2001 : 5.AB.15
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