schorl

American  

[shawrl] / ʃɔrl /

noun

1. Mineralogy. a black tourmaline.

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schorl British  

/ ʃɔːl /

noun

1. a black tourmaline consisting of a borosilicate of sodium, iron, and aluminium. Formula: NaFe 3 B 3 Al 3 (Al 3 Si 6 O 27 )(OH) 4

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Other Word Forms

• schorlaceous adjective

Etymology

Origin of schorl

First recorded in 1755–65, schorl is from the German word Schörl

Example Sentences

La pierre constituante de la montagne d'Oris est en g�n�ral le Kneifs ou la roche feuillet�e mica et quartz � couches plus ou moins ferr�es quelquefois le schorl en roche p�n�tr� de st�atite.

From Theory of the Earth, Volume 1 (of 4) by Hutton, James

The former of these is an aggregate of schorl, or tourmaline, and quartz.

From The Student's Elements of Geology by Lyell, Charles, Sir

Greisen is closely connected with schorl rock both in its mineralogical composition and in its mode of origin.

From Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 5 "Greek Law" to "Ground-Squirrel" by Various

I saw distinctly that, wherever they crossed each other, the veins containing mica and black schorl traversed and drove out of their direction those which contained only white quartz and feldspar.

From Personal Narrative of Travels to the Equinoctial Regions of America, During the Year 1799-1804 — Volume 2 by Humboldt, Alexander von

On its northern slope is a vast mass of schorl, the celebrated Roche Rock.

From Nooks and Corners of Cornwall by Scott, C. A. Dawson