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

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