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Quartz

Amethyst

MNHN N°204.133

visu_125 infos

FROM : Les Issarts, St Jacques d'Ambur, Puy-de-Dôme, France
SIZE : 22 x 10.5 x 9 cm

general description

This specimen is made up of purple amethyst crystals (detail 1). It measures 22 x 10.5 x 9 cm and arises from the outcrop of Les Issarts in the Puy-de-Dôme area in Central France.

The support from Total made possible the acquisition of this specimen, currently kept in the storage rooms of the collections of the Muséum national d'Histoire naturelle (i.e., not yet displayed to the public).

Photography: Louis-Dominique Bayle, © MNHN.

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The Species page

Identity card

SPECIE : Quartz
VARIETY :Amethyst

HISTORY : Name inspired by "quarz", old german word "querch" meaning dwarf

Species known since Prehistory

Type-locality: undefined because species already known by the Ancients

CHEMICAL FORMULA : SiO2
CRYSTAL SYSTEM : Rhomboedric
COLOR : Colourless, white, pink, violett, black, yellow
DIAPHANIETY : Transparent to opaque
LUSTER : Vitreux to greasy
STREAK : White
MORPHOLOGY : Prismatic crystals, massive, forming aggregates
HARDNESS : 7
DENSITY : 2,66

CHEMICAL CLASS : IV - Oxides and hydroxide
GROUP : Quartz
STRUNZ CLASS BEFORE 2001 : 4/D.01-10
STRUNZ CLASS AFTER 2001 : 4.DA.05

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