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Download hereGENERAL DESCRIPTION
Jeremejevite is a hydrated aluminum borate. It is formed under magmatic hydrothermal conditions within granitic pegmatites.
The crystals are prismatic, hexagonal and are elongated. They generally present a pyramidal termination. They are transparent and often two-tone: the base of the crystals is blue and their termination is colourless. They can show colour zoning and pleochroism. Jeremejevite is associated with albite, tourmaline, quartz and gypsum. The crystals can measure up to 10 cm in length.
This species is also piezoelectric. The most known despoits are the Soktui Range in Siberia, which produced large-size crystals and from Cape Cross in Namibia, where the crystals are gemmeous.
No occurrence is yet reported in France but many are known in Germany so it is likely that jeremejevite is also present in France but anybody has yet recognized and/or announced and/or validated its presence in specialized journals.
The type (described in 1883) is kept at Institut of Mines of Saint Petersbourg (Санкт-Петербургский Государственный Горный Инстит) in Russia. L'échantillon-type is originating from Soktuj Gora (Soktuj Range) in the Adun-Cholon massif, mining district of Nertschinsk (Nerchinsk) in the Republic of Buriatia (Buryatia) in Transbaïkalie (Zabaykalye), Eastern Siberia, Federation of Russia.
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 : Colorless, very pale blueish, yellowish
DIAPHANIETY : Transparent
LUSTER : Vitreous
STREAK : White
MORPHOLOGIE : Prismatic hexagonal crystals
HARDNESS : 6,5-7,5
CHEMICAL CLASS: 3,284
DENSITY : V - Carbonates, nitrates and borates
GROUP : Jeremevevite
STRUNZ CLASS BEFORE 2001 : 5/G.05-30
STRUNZ CLASS AFTER 2001 : 6.AB.15
