noun
diorite
A coarse-grained intrusive igneous rock, intermediate in composition between granite and gabbro. Used in geology and petrology.
閃緑岩は建築材料として使われることがある。
Diorite is sometimes used as a building material.
The kanji 閃 (flash, glitter) and 緑 (green) combine with 岩 (rock) to describe the rock's appearance. The reading is on'yomi. The exact historical derivation of the term is uncertain.