In geology, luster refers to the appearance of a mineral in respect to the reflection of light. Luster is not a term used to define the appearance of rock.
Luster is not a change, it is a characteristic.
It's not exactly that rocks don't have luster/can't be shiny, but luster is a characteristic that we typically apply to minerals to help categorize and describe them. Rocks are made up of minerals so you may be able to spot some of the luster within a rock depending on the minerals it is made of.
Rock luster refers to the way light interacts with the surface of a rock. It can be categorized as metallic, vitreous (glassy), pearly, silky, and dull or earthy. Luster can help identify different types of rocks and minerals.
The luster of pumice is vitreous (glassy).
The luster of rock salt is Vitreous (glassy)
metallic luster
It depends on the rock.
The way a rock reflects light is called its luster. Luster refers to how light interacts with the surface of a mineral, rock, or crystal. Minerals can exhibit metallic, glassy, pearly, or dull luster, among others.
A waxy luster gives minerals a shiny appearance.
In chemistry, luster refers to the way a substance reflects light. Substances with high luster appear shiny and reflective, while substances with low luster appear dull. Luster is often a characteristic used to describe the physical appearance of metals and minerals.
A waxy luster gives minerals a shiny appearance.
luster is how a rock or mineral feflects light on it's physical appearance