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Jeremejevite

MNHN N°202.167

visu_81 infos

FROM : Erongo Mountains, Namibia
SIZE : 2.5 x 0.5 cm and 3.4 x 0.5 cm

general description

These are 2 isolated crystals of jeremejevite. The first crystal is translucent, its base is slightly blue, it measures 2.5 x 0.5 cm. The second crystal is two-coloured: blue at its base until mid-hight and transparent white termination, the termination measures 3.4 x 0.5 cm.

This sample comes from the mineral deposit of Erongo Mountains in Namibia. Acquired thanks to support from Total, it is today 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.

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The Species page

Identity card

SPECIE : Jeremejevite

HISTORY : Species dedicated to Pavel Vladimirovich Eremeev (1830-1899), Russian mineralogist and cristallographer who discovered the mineral

Species first described in 1883 by Augustin Alexis Damour (1808-1902), French chemist

Type-locality : Mont Soktui, Nerchinsk district, Russia

CHEMICAL FORMULA : Al6(BO3)5(F,OH)3
CRYSTAL SYSTEM : Hexagonal
COLOR : Colourless, very pale blueish, yellowish
DIAPHANIETY : Transparent
LUSTER : Vitreous
STREAK : White
MORPHOLOGY : Prismatic hexagonal crystals
HARDNESS : 6,5-7,5
DENSITY : 3,284

CHEMICAL CLASS : V - Carbonates, nitrates
GROUP : Jeremevevite
STRUNZ CLASS BEFORE 2001 : 5/G.05-30
STRUNZ CLASS AFTER 2001 : 6.AB.15

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