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出典:Wiktionary
出典:『Wiktionary』 (2015/04/02 05:46 UTC 版)
From German Feldspath (“feldspar”) + -oid.
feldspathoid (countable かつ uncountable, 複数形 feldspathoids)
feldspathoid (not comparable)
出典:Wikipedia
出典:『Wikipedia』 (2010/08/07 17:14 UTC 版)
The feldspathoids are a group of tectosilicate minerals which resemble feldspars but have a different structure and much lower silica content. They occur in rare and unusual types of igneous rocks.
feldspathoid