a dense, fine-grained, igneous rock consisting typically of feldspar and quartz, both of which may appear as phenocrysts.

1785–95; fels(par) + -ite1

felsitic [fel-sit-ik] , adjective
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World English Dictionary
felsite or felstone (ˈfɛlsaɪt, ˈfɛlˌstəʊn)
any fine-grained igneous rock consisting essentially of quartz and feldspar
[C18: fels(par) + -ite1]
felstone or felstone
[C18: fels(par) + -ite1]
felsitic or felstone

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
felsite   (fěl'sīt')  Pronunciation Key 
A fine-grained, light-colored igneous rock, consisting mainly of feldspar and quartz.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The placement of the post-felsite intrusion to the northwest is speculative.
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