noun
moonstone
A gemstone from the feldspar group known for its adularescence. Used in jewelry and as a collector's mineral.
月長石は、月光のような青白い輝きが特徴です。
Moonstone is characterized by a pale bluish shimmer like moonlight.
Compound of 月 (moon) + 長石 (feldspar), referring to its moon-like sheen and mineral family.