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Schorl (Black Tourmaline) is the most common variety of tourmaline, first described by Mathesius in 1524. It may account for 95% or more of all tourmaline in nature. The word tourmaline is a corruption of the Sinhalese word turamali, meaning "stone attracting ash" (a reference to its pyroelectric properties). The meaning of the word "schorl" is a mystery, but it may be a Scandinavian word.
NaFe3(Al,Fe)6Si6O18(BO3)3(OH)4 -
Sodium Iron Aluminum Boro-silicate Hydroxide
Class:
Subclass:
Group:
Black
White
Vitreous to dull
Translucent to opaque
3.2
7 - 7.5
None
Uneven to conchoidal
Long to short prismatic crystals, columnar to acicular aggreates, granular, massive
None
Frequency:
Abundant
Origin:
Magmatic in granites and granatic pegmatites; hydrothermal in greisens, in quartz and ore veins; metamorphic in migmatites, gneisses, mica, schists and tourmalinites.

Occurence:
Arendal, Norway; Kaatiala, Finland; Namibia
Application:
Ornamental uses, as a mineral specimen

 
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