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Mineralpedia Details for Schorl

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Schorl

Schorl

A Tourmaline group mineral named for the Old German word schürl, a word of unknown derivation which may mean “impurities,” or may be in reference to an old German village called Schorl, now called Zorschlau, which had a nearby tin mine that contained Schorl. Schorl is the most common of the tourmalines and can be found in many localities, but a few know for exceptional specimens include Germany, England, Italy, Russia, the USA, Mexico, Brazil, Namibia, and Afghanistan. Schorl is a common constituent of granite and granite pegmatites, can be found in hydrothermal veins and metamorphic rocks, and is occasionally found as a detrital mineral. Schorl is pyroelectric, has a charge when heated, and piezoelectric, forms a charge in response to pressure.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/schorl.pdf

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 
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Schorl from DOT mine, Custer Co., South Dakota, United States

Schorl
            from DOT mine, Custer Co., South Dakota, United States

Schorl Tourmaline to 2.5cm.

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Schorl from Anzar Army Camp, Gilgit-Skardu Rd., Northern Areas, Pakistan

Schorl
            from Anzar Army Camp, Gilgit-Skardu Rd., Northern Areas, Pakistan

A terminated 5.5cm striated, black Schorl tourmaline crystals with snow white Albite crystals.

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Schorl from Dassu, Haramosh Range, Balistan, Northern Areas, Pakistan

Schorl
            from 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.

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Schorl from Erongo Mountains, Karibib, Erongo Region, Namibia

Schorl
            from Erongo Mountains, Karibib, Erongo Region, Namibia

An excellent grouping of black lustrous crystals of trigonally terminated Schorl crystals to 5-8mm.

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Schorl from Timber Butte, Silver Bow Co., Montana, United States

Schorl
            from Timber Butte, Silver Bow Co., Montana, United States

Lustrous deep black nicely terminated Schorl tourmaline. E

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Schorl from Boulder Batholith, Jefferson Co., Montana, United States

Schorl
            from Boulder Batholith, Jefferson Co., Montana, United States
Special Info
Chris van Laer Collection

Stubby, striated Schorl crystal with TEN faces on the termination. From this area, it is an excellent specimen from the miarolitic cavities.

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