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pyrophyllite

[pahy-ruh-fil-ahyt, pahy-rof-uh-lahyt] /ˌpaɪ rəˈfɪl aɪt, paɪˈrɒf əˌlaɪt/
noun
1.
Mineralogy. a phyllosilicate, AlSi 2 O 5 (OH), usually having a white or greenish color, and occurring in either foliated or compact masses, the latter variety being used like soapstone.
Origin of pyrophyllite
1820-1830
First recorded in 1820-30, pyrophyllite is from the German word Pyrophyllit; so called because it exfoliates when heated. See pyro-, -phyll, -ite1
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for pyrophyllite
Historical Examples
  • pyrophyllite (hydrated aluminum silicate) resembles talc in some of its properties and is used in much the same way.

British Dictionary definitions for pyrophyllite

pyrophyllite

/ˌpaɪrəʊˈfɪlaɪt/
noun
1.
a white, silvery, or green micaceous mineral that consists of hydrated aluminium silicate in monoclinic crystalline form and occurs in metamorphic rocks. Formula: Al2Si4O10(OH)2
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
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