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A grayish-white, completely crystalline dyke-like rock. It is composed of alkali feldspar, quartz, and plagioclase, with small amounts of biotite, muscovite, garnet, and tourmaline. Its chemical composition is similar to granite. It is used as a raw material for ceramics.

Source: Morikita Publishing "Chemical Dictionary (2nd Edition)" Information about the Chemical Dictionary 2nd Edition

灰白色の完全結晶性の岩脈状岩体．アルカリ長石，石英，斜長石からなり，少量の黒雲母，白雲母，ざくろ石，電気石を含む．化学組成は花こう岩に似る．陶磁器の原料として使用される．

出典　森北出版「化学辞典（第2版）」化学辞典 第2版について　情報