Muséum national d'histoire naturelle _ The species

FROM : Mugla, Massif de Menderes, Turquie
SIZE : 2.9 x 1.1 x 1.1 cm

This sample is a diaspore cut as a rectangle, this cutting is called elongated emeraud cut. From a pinkish brown colour, it turns greenish when the angle viewing changes. It weighs 37.1 carats (equivalent to 7.6 grames) and measures 2.9 x 1.1 x 1.1 cm.

The Muséum national d'Histoire naturelle acquired it after an exchange of minerals with Mr Grundmann. The uncut sample used for this stone comes from Mugla in Turkey.

It is currently exposed in the Treasure Room, within the Gallery of Mineralogy of the Muséum national d’Histoire naturelle.

Photography: Louis-Dominique Bayle, © MNHN.
3D View: Alain Dahmane / Photo Saint-Hilaire, © MNHN.

SPECIE : Diaspore

HISTORY : Name inspired by the Greek word "διασπορ" [diaspor] meaning "dispersion", because of its fragmentation during heating

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

Type-locality: Mramorskoi, Kossoibrod, Ural Russia

CHEMICAL FORMULA : AlO (OH)
CRYSTAL SYSTEM : Orthorhombic
COLOR : White, pale gray, colorless, greenish, brown, yellow
DIAPHANIETY : Transparent to translucent
LUSTER : Adamantine to vitreous
STREAK : White
MORPHOLOGY : Elongated crystals, acicular, forming stalactites
HARDNESS : 6,5-7,0
DENSITY : 3,38

CHEMICAL CLASS : IV - Oxides and hydroxide
GROUP : Diaspore
STRUNZ CLASS BEFORE 2001 : 4/F.06-10
STRUNZ CLASS AFTER 2001 : 4.FD.10

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Diaspore

Diaspore

MNHN N°182.2

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