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schorl

American  
[shawrl] / ʃɔrl /

noun

  1. Mineralogy. a black tourmaline.


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

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Other Word Forms

Etymology

Origin of schorl

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

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

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

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)

The lowest range above Djidda is calcareous; but its rocks soon change into gneiss, and a species of granite, with schorl in the place of feldspath, accompanied by predominant masses of quartz, and some mica.

From Travels in Arabia; comprehending an account of those territories in Hedjaz which the Mohammedans regard as sacred by Burckhardt, John Lewis

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 Howard-Bury, Charles Kenneth

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