Muséum national d'histoire naturelle _ The species

FROM : Mount Saint-Hilaire, Quebec, Canada
SIZE : 4.2 x 3 x 3 cm

This sample is composed of a mangano-neptunite crystal (pyramidal russet crystal) associated with analcime (white crystals), serandite (orange crystal foreground) and aegirine (black sticks).

This specimen comes from Mount Saint-Hilaire in Canada. The Muséum national d’Histoire naturelle could obtain it thanks to support from Total. It is kept in the storage rooms of the collections (i.e., not yet displayed to the public).

Photography and 3D veiw: A. Dahmane / Photo Saint-Hilaire, © MNHN.

SPECIE : Mangano-neptunite

HISTORY : Name from the Roman mythology : Neptune, the Roman God of the Sea and its manganoan composition

Species first described in 1923 par Kurbatov, Russian mineralogist

Type-locality : Mount Maly Mannepakhk, Kola Peninsula, Russia

CHEMICAL FORMULA : Na2 K Li (Mn2+, Fe2+)2 Ti2 [Si8O24]
CRYSTAL SYSTEM : Monoclinic
COLOR : Orange, cherry-red
DIAPHANIETY : Transparent to translucent
LUSTER : Vitreous to resineous
STREAK : Red-brownish
MORPHOLOGY : Prismatic crystals often elongated
HARDNESS : 5,0-6,0
DENSITY : 3,26

CHEMICAL CLASS : VIII - Silicates
GROUP : Neptunite series
STRUNZ CLASS BEFORE 2001 : 8/F.37-20
STRUNZ CLASS AFTER 2001 : 9.EH.05

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