Muséum national d'histoire naturelle _ The species

FROM : Pass of la Madeleine, Savoie, France
SIZE : 9.5 x 6 x 5.7 cm

This specimen shows a series of crystals of anatase on matrix. These gray-bluish crystals are very elongated. They are associated with large milky quartz crystals.

This specimen comes from the Pass of La Madeleine in Savoy and was acquired thanks to support from Total. It is 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.

SPECIE : Anatase

HISTORY : Name inspired by the Greek word [anatasis] meaning stretched, in relation to the elongated habit of its crystals

Species first described in 1801 by René-Just Haüy (1743-1822), French mineralogist and cristallographer

Type-locality: Saint-Christophe, Bourg d'Oisans, Isère, France

CHEMICAL FORMULA : Ti O 2
CRYSTAL SYSTEM : Tetragonal
COLOR : Brown, yellow, gray, black, blueish
DIAPHANIETY : Transparent to opaque
LUSTER : Adamantine to metallic
STREAK : White to pale yellow
MORPHOLOGY : Bipyramidal crystals, more often
HARDNESS : 5,5-6,0
DENSITY : 3,89

CHEMICAL CLASS : IV - Oxides and hydroxide
GROUP : Anatase
STRUNZ CLASS BEFORE 2001 : 4/D.14-10
STRUNZ CLASS AFTER 2001 : 4.DD.05

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Anatase

Anatase

MNHN N°194.22

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