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

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Etymology

Origin of schorl

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

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Example Sentences

See Examples For:

schorl

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 Arthur L. (Arthur Leslie) Salmon

I observed neither hornblende, black schorl, nor rutile titanite, in this granite.

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

Both biotite-gneiss and metamorphosed sedimentaries are crowded with dykes and sills, of all dimensions, of schorl granite or pegmatite to such an extent that this granite is frequently the predominant rock.

From Mount Everest the Reconnaissance, 1921 by Charles Kenneth Howard-Bury

In the tourmaline granites prisms of black schorl occur either singly or in stellate groups.

From Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 3 "Gordon, Lord George" to "Grasses" 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 Alexander von Humboldt

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