perthite
noun
perth·ite
ˈpərˌthīt
plural -s
: a feldspar rock consisting of orthoclase or microcline in which is interlaminated albite
perthitic
adjective
ˈpər¦thitik
perthitically
adverb
-tə̇k(ə)lē
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Merriam-Webster unabridged
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