schorl

[shawrl]

noun

1. Mineralogy.,  a black tourmaline.

schorl

/ 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

Other Word Forms

• schorlaceous adjective

Word History and Origins

Origin of schorl¹

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

Word History and Origins

Origin of schorl¹

C18: from German Schörl, origin unknown

Example Sentences

“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.

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

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

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

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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.

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