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Quartz

MNHN N°174.124

visu_149 infos

FROM : Mine of Taillat, Allevard, Isère, France
SIZE : 12 x 13 cm

general description

This sample is made of hyaline quartz on brown siderite crystals. Siderite crystals are rhomboedric with a greasy lustre. Quartz is colourless, crystals measures on the average 1.5 cm. It seems likely that one observes crystals with a la Gardette twin (association of two crystals meet at an angle of 84.33°). The sample measures 12 x 13 cm.

This specimen comes from Taillat deposit, Isère in France. It was offered to the Muséum national d'Histoire naturelle by the association of "les Amis de la Minéralogie".

It is kept in the storage rooms of the collections of the Muséum (i.e., not yet displayed to the public).

Photography: Louis-Dominique Bayle , © MNHN.

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The Species page

Identity card

SPECIE : Quartz

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, violet, black, yellow
DIAPHANIETY : Transparent to opaque
LUSTER : Vitreous 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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