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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
1820-1830
1820-30; < German Pyrophyllit; so called because it exfoliates when heated. See pyro-, -phyll, -ite1
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for pyro-phyllite

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
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Encyclopedia Article for pyro-phyllite

pyrophyllite

very soft, pale-coloured silicate mineral, hydrated aluminum silicate, Al2(OH)2 Si4O10, that is the main constituent of some schistose rocks. The most extensive commercial deposits are in North Carolina, but pyrophyllite is also mined in California, China, India, Thailand, Japan, Korea, and South Africa. Talclike foliated masses occur in the Urals, in Switzerland, and in other localities.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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