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

“Tourmaline hornfelses” are found sometimes near the margins of tourmaline granites; they are black with small needles of schorl which under the microscope are dark brown and richly pleochroic.

From Encyclopaedia Britannica, 11th Edition, Volume 13, Slice 6 "Home, Daniel" to "Hortensius, Quintus" by Various

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

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 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

Among these black schorl or tourmaline, actinolite, zircon, garnet, and fluor spar are not uncommon; but they are too sparingly dispersed to modify the general aspect of the rock.

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

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