pyro phyllite

pyrophyllite

[pahy-ruh-fil-ahyt, pahy-rof-uh-lahyt]
noun
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:
1820–30; < German Pyrophyllit; so called because it exfoliates when heated. See pyro-, -phyll, -ite1

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World English Dictionary
pyrophyllite (ˌpaɪrəʊˈfɪlaɪt)
 
n
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

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