Jeremejevite

Formula:  Al6B5O15(F,OH)3

Origin of name:  For P. Jeremejev, Russian mineralogist

 

Crystal system:  Hexagonal

Crystal class:  6/m

Twinning: 

Unit cell: a = 8.59 Ǻ, c = 8.22 Ǻ

 

Colour:  Colourless to pale yellowish brown

Diaphaneity: 

Luster:  Vitreous

Habit:  Crystals prismatic, elongated, hexagonal, to large size

Hardness:  7.5

Specific gravity:  3.29

Cleavage:  None

Tenacity:  Conchoidal

Streak: 

 

Synonyms/varieties:

 

Comments:  Other transliterations of the name include Eremeevite, Eremyeevite, and Yeremeyevite

 

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