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Anatase

Anatase

MNHN N°205.115

visu_70 infos
FROM : Kharan Mountains, Balushistan, Pakistan
SIZE : 12.5 x 12.5 cm

general description

This sample presents anatase and quartz crystals on matrix. The whole piece measures 12.5 x 12.5 cm.

The anatase crystals measure approximately 1 cm in length; they are black-bluish, biterminated and perfectly crystallized. Quartz is present in the form of transparent colourless crystals up to 2,5 cm in length.

This specimen comes from the Kharan Mounts in Pakistan. Thanks to support from Total, the Muséum national d’Histoire naturelle obtained this sample. It is currently kept in the storage rooms of the collections (i.e., not yet displayed to the public).

Photography: Louis-Dominique Bayle, © MNHN.
The Species page
Identity card
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 : TiO2
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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