Muséum national d'histoire naturelle _ The species

FROM : Jugnot, Tangir valley, Pakistan
SIZE : 12.7 x 8 cm

This sample shows many black crystals of chevkinite-(Ce), biterminated (flat termination), their resineous lusters are well marked. The sample measures 12.7 x 8 cm, crystals measure until 3 x 1.5 cm.

This sample comes from Jugnot pakistanish mine in Tangir valley. It was acquired thanks to support from Total.

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 : Chevkinite (Ce)

HISTORY : Species dedicated to Konstantin Vladimirovich Chevkin (1802-1875), Russian general. Presence of the cerium (Ce) element

Species first described in 1839 by Gustav Rose (1798-1873), German mineralogist

Type-locality: Monts Ilmen, Oural, Russia

CHEMICAL FORMULA : (Ce)4(Fe2+,Mg)2 (Ti,Fe3+)3 Si4O22
CRYSTAL SYSTEM : Monoclinic
COLOR : Black to brown dark
DIAPHANIETY : Opaque
LUSTER : Resineous to dull
STREAK : White
MORPHOLOGY : Small prismatic crystals, lamellars, lenticular, massive
HARDNESS : 5,5-6,0
DENSITY : 4,99

CHEMICAL CLASS : VIII - Silicates
GROUP : Chevkinite
STRUNZ CLASS BEFORE 2001 : 8/C.17-20
STRUNZ CLASS AFTER 2001 : 9.BE.55

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Chevkinite (Ce)

Chevkinite (Ce)

MNHN N°201.181

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