lustre
n.n. a shiny or glossy appearance on a surface. You often see this on things like polished stones or metals.
n. a smooth, glossy, or shining appearance on a surface. Often used in geological or mineralogical contexts to describe the reflective quality of a mineral.
The polished stone has a beautiful lustre.
The geologist examined the mineral's lustre under a lamp to help identify its type.
While the rock's internal structure was relatively simple, its surface exhibited a striking metallic lustre that suggested the presence of rare trace elements.
From Middle French lustre. See luster (etymology 1).
From Middle English lustre, from Latin lustrum, from Old Latin *loustrom, of uncertain origin. More at lustrum.
From Latin lustra (“wilds, woods”), thought to derive from unattested dustrum, from unattested Ancient Greek δύστρον (*dústron, “place animals wallow”), from δύω (dúō, “to plunge, to wallow”).