Jisho

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けいちょうがん 珪長岩
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Noun
1. felsite; felstone​
Wikipedia definition
2. Felsite​Felsite 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 except dark gray, green or black (the colors of trap rock).
Read “Felsite” on English Wikipedia
Read “珪長岩” on Japanese Wikipedia
Read “Felsite” on DBpedia

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