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珪長岩 (keichougan) Japanese meaning: felsite | Kotomora

珪けい長ちょう岩がん

Meanings

1

felsite; felstone

A fine-grained igneous rock composed mainly of felsic minerals. Technical term used in geology and mineralogy.

この地ち域いきの珪けい長ちょう岩がんは石せき英えいと長ちょう石せきを多おおく含ふくんでいる。
The felsite in this area contains a lot of quartz and feldspar.

Kanji

珪jade scepter or tablet (authority symbol)
長long, leader, superior
岩boulder, rock, cliff

Etymology

Compound of 珪 (kei, 'silica') + 長 (chō, from 長石 'feldspar') + 岩 (gan, 'rock'). The exact derivation is uncertain; the spelling is conventionally associated with the meaning.