noun
greasy luster; greasy shine
Geological term describing a mineral's surface that appears as if coated with a thin layer of oil or fat. Used in mineralogy and petrology.
この鉱物は脂肪光沢を示す。
This mineral exhibits a greasy luster.
Compound of 脂肪 (fat, grease) and 光沢 (luster, gloss). The term directly describes the visual quality resembling a greasy surface.