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Schorl tourmaline

#35990
SOLD
Schorl from Dassu, Haramosh Range, Balistan, Northern Areas, Pakistan - 35990
Schorl from Dassu, Haramosh Range, Balistan, Northern Areas, Pakistan - 35990

Schorl tourmaline

#35990
Availability
Sold
Size
2 x 2 x 2 cm - Thumbnail 
Formula
NaFe2+3Al6(BO3)3Si6O18(OH)4 (RRUFF)
Locality
Dassu, Haramosh Range, Balistan, Northern Areas, Pakistan

This is a cap from a larger prismatic crystal with an extreme pyramidal termination not generally seen in large crystals of tourmaline like this.

Schorl

Formula
NaFe2+3Al6(BO3)3Si6O18(OH)4 
Crystal System
Trigonal 
Crystal Habit
Acicular, Prismatic, Striated 
Cleavage
Indistinct, None, None 
Luster
Vitreous (Glassy) 
Color
black, brownish black, greenish black, bluish black 
Streak
brown 
Class
Trigonal - Ditrigonal Pyramidal 
Fracture
Brittle - Conchoidal 
Hardness
7.5 

Data courtesy of Webmineral.

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