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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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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Example sentences
Pyrophyllite has no layer charge and no interlayer cations.
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