Felsite (also called felstone ) is a very fine grained volcanic rock that may or may not contain larger crystals. Felsite is a field term for a light colored rock that typically requires petrographic examination or chemical analysis for more precise definition. Color is generally white through light gray, or red to tan and may include any color ex...
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http://en.wikipedia.org/wiki/Felsite
• (n.) A finegrained rock, flintlike in fracture, consisting essentially of orthoclase feldspar with occasional grains of quartz.
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http://thinkexist.com/dictionary/meaning/felsite/
Fel'site noun [ Confer
Feldspar .]
(Min.) A finegrained rock, flintlike in fracture, consisting essentially of orthoclase feldspar with occasional grains of quartz.
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http://www.encyclo.co.uk/webster/F/17
A general term for lightcolored aphanitic (fine-grained) igneous rocks. Example: rhyolite.
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http://www.evcforum.net/WebPages/Glossary_Geology.html
Felsite or felstone is a hard, compact, volcanic, fine grained rock, flint-like in fracture, consisting essentially of orthoclase feldspar with occasional grains of quartz occurring in the older geological formations.
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http://www.probertencyclopaedia.com/browse/HF.HTM
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