Muséum national d'histoire naturelle _ The species

FROM : Tyrol, Austria
SIZE : 3.8 x 2.8 x 1.5 cm

This titanite crystal is isolated, transparent, and green with a vitreous lustre. Very-well crystalized and terminated, it measures 3.8 x 2.8 x 1.5 cm.

This sample comes from Tyrol mountains in Austria. It has been acquired in october 1970 thanks to an exchange of minerals with Mr. Péjovic. 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 : Titanite

HISTORY : Name given because of its composition, bearing titanium

Species first described in 1795 by Martin Heinrich Klaproth (1743-1817), German professor of chemistry, University of Berlin

Type-locality: Passau, Bavaria, Germany
ANCIENT NAME : Sphène

CHEMICAL FORMULA : Ca Ti SiO5
CRYSTAL SYSTEM : Monoclinic
COLOR : Colourless, yellow, green, gray, black
DIAPHANIETY : Transparent to opaque
LUSTER : Adamantine to resineous
STREAK : White
MORPHOLOGY : Prismatic crystals, compact, flattened
HARDNESS : 5,0-5,5
DENSITY : 3,53

CHEMICAL CLASS : VIII - Silicates
GROUP : Titanite
STRUNZ CLASS BEFORE 2001 : 8/B.12-10
STRUNZ CLASS AFTER 2001 : 9.AG.15

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Titanite

Titanite

MNHN N°170.339

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