nepheline
A feldspathoid mineral; technical term used in geology and mineralogy.
霞石は、主にアルカリ火成岩に含まれる鉱物です。
Nepheline is a mineral found mainly in alkaline igneous rocks.
The Japanese name 霞石 literally means 'mist stone', likely referring to its cloudy or greasy appearance. The exact origin of the name is uncertain.