noun
quartz sand; silica sand
Technical term for sand composed mainly of quartz or silica, used in glassmaking, construction, and industrial applications.
ガラスの原料として珪砂が使われる。
Quartz sand is used as a raw material for glass.
この工場では高純度の珪砂を精製している。
This factory refines high-purity silica sand.
Compound of 珪 (kei, 'silicon') and 砂 (sha, 'sand'). The kanji 珪 and 硅 both represent silicon; 珪 is the more common form in this compound.