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 (pī′rō-fĭl′īt′, pī-rŏf′ə-līt′)
A silvery white or pale green aluminum silicate mineral, Al2Si4O10(OH)2, occurring naturally in soft compact masses.


(Minerals) 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


(ˌpaɪ rəˈfɪl aɪt, paɪˈrɒf əˌlaɪt)

a mineral, hydrous aluminum silicate, Al2Si4O10(OH)2, usu. having a white or greenish color and occurring in foliated and granular masses.
[1820–30; < German Pyrophyllit; so called because it exfoliates when heated. See pyro-, -phyll, -ite1]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.pyrophyllite - a white or greenish aluminum silicate mineral (resembles talc)
mineral - solid homogeneous inorganic substances occurring in nature having a definite chemical composition
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6, reaching for Hillsboro pyrophyllite 80.26 [m.sup.2]/g and for Zalamea pyrophylite 70.89 [m.sup.2]/g after 20 hrs.
1988 1989 1990 Silica stone 16,214 17,223 17,896 Silica sand 4,200 4,377 4,430 Limestone 182,468 190,859 198,199 Dolomite 5,243 5,465 5,370 Pyrophylite 950 922 890 Pyrophylite clay 295 311 322 TABLE IV.