mica
It goes shiny and smooth.
i think that igneous and metamorphic rocks uses luster because maybe they have it in them
use conditioner, it's gonna make your hairs shiny and smooth.
Igneous rocks that cool quickly do not have time to form large crystals. This results in a fine-grained texture that appears smooth and may reflect light in a shiny manner. Examples of these rocks include basalt and obsidian.
It isn't.... take water for example it isn't "smooth" or "shiny" but has reflective properties
why are most of rocks extremely smooth
obsidian
Shiny and smooth.
Because it is a metal and can be polished to a smooth shiny surface.
gloss
By weathering. The water currents weather the rocks leaving them smooth.
gleaming chromed refulgent effulgent lustrous glistening reflective polished shiny-smooth brilliant crystalline candy diamantine