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

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

Structurally, therefore, these isles are a continuation of Land's End, but the granite has become less consistent and more friable; it is largely broken into felspar, quartz, and mica, with schorl, chlorite, and hornblende.

From The Cornwall Coast by Salmon, Arthur L. (Arthur Leslie)

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

Sometimes the red schorl occurs only in dendritic crystals of a bright red.*

From Personal Narrative of Travels to the Equinoctial Regions of America, During the Year 1799-1804 — Volume 1 by Ross, Thomasina

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

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