- Mineralogy. a phyllosilicate, AlSi2O5(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
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Examples from the Web for pyrophyllite
Pyrophyllite (hydrated aluminum silicate) resembles talc in some of its properties and is used in much the same way.The Economic Aspect of Geology
C. K. Leith
- a white, silvery, or green micaceous mineral that consists of hydrated aluminium silicate in monoclinic crystalline form and occurs in metamorphic rocks. Formula: Al 2 Si 4 O 10 (OH) 2