Muséum national d'histoire naturelle _ The species

FROM : Kozano Munjan, Badakshan, Afghanistan
SIZE : 13.5 x 6.3 x 3 cm

This monocrystal of white tremolite is partly gem. It measures 13.5 x 6.3 x 3 cm. One observes some iridescences due to diffraction of light.

This sample, acquired thanks to support from Total, comes from afghan Kozano Munjan deposit. This sample is currently exposed in the Treasure Room, within the Gallery of Mineralogy of the Muséum national d’Histoire naturelle.

Photography: Louis-Dominique Bayle, © MNHN.

SPECIE : Tremolite

HISTORY : Named to recall the locality where the type specimen was supposed to come from Tremola valley, Gotthard, Switzerland

Species first described in 1790 by Johann Georg Albrecht Höpfner (1759-1813), Swiss pharmacian and journalist

Type-locality: Campolungo, Tessin, Switzerland

CHEMICAL FORMULA : Ca2 (Fe2+,Mg)5 Si8O22 (OH)2
CRYSTAL SYSTEM : Monoclinic
COLOR : White, gray, pink
DIAPHANIETY : Transparent to translucent
LUSTER : Vitreous
STREAK : White
MORPHOLOGY : Elongated crystals, prismatic, fibrous, forming aggregates
HARDNESS : 5,0-6,0
DENSITY : 2,964

CHEMICAL CLASS : VIII - Silicates
GROUP : Clinoamphibole (Ca)
STRUNZ CLASS BEFORE 2001 : 8/F.10-10
STRUNZ CLASS AFTER 2001 : 9.DE.10

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Tremolite

MNHN N°191.40

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