noun
granulite
A high-grade metamorphic rock composed mainly of feldspar and quartz, typically formed under high temperature and pressure conditions. Used in geology.
白粒岩は、変成岩の一種で、主に長石と石英からなる。
Granulite is a type of metamorphic rock, consisting mainly of feldspar and quartz.
The term 白粒岩 is a Japanese coinage from 白 (white) + 粒 (grain) + 岩 (rock), describing the rock's granular texture and light color. The reading はくりゅうがん follows standard on'yomi.