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Schorl tourmaline

#PD41538
SOLD
Schorl from Champion mine, Marquette Co., Michigan, United States - PD41538
Schorl from Champion mine, Marquette Co., Michigan, United States - PD41538

Schorl tourmaline

#PD41538
Availability
Sold
Size
8 x 3 x 2 cm - Sm Cabinet 
Formula
NaFe2+3Al6(BO3)3Si6O18(OH)4 (RRUFF)
Locality
Champion mine, Marquette Co., Michigan, United States

Schorl is the typical black tourmaline which is found in metamorphic rock. It is found as a product of metasomatism also in schists bording pegmatites rich in boron.

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.

Collection
Phillips Collection
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