phyllitic

phyllite

[fil-ahyt]
noun
a slaty rock, the cleavage planes of which have a luster imparted by minute scales of mica.

Origin:
1820–30; phyll- + -ite1

phyllitic [fi-lit-ik] , adjective
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Collins
World English Dictionary
phyllite (ˈfɪlaɪt)
 
n
a compact lustrous metamorphic rock, rich in mica, derived from a shale or other clay-rich rock
 
[C19: from phyll(o)- + -ite1]
 
phyllitic
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
phyllite   (fĭl'īt')  Pronunciation Key 
A green, gray, or red metamorphic rock, similar to slate but often having a wavy surface and a distinctive luster imparted by the presence of mica.
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