luster
You "crack" it.
The bumpy mirror will reflect the light at a weird angle, not the one you would expect, based on where the light source is coming from. The smooth mirror will act normal
Diamond cut is perhaps the most important of the four Cs, so it is important to understand how this quality affects the properties and values of a diamond. A good cut gives a diamond its brilliance and shine. The angles and finish of any diamond are what determine its ability to handle light, which leads to fire, brilliance & scintillation
Luster is the light reflection a mineral has, which can be broken down into categories like metallic, silky, and dull. The luster dictates what type of mineral it is.
The term used to describe ' how a mineral reflect light from its surface ' is Lustre .
it can only reflect off a minerals surface if it had the luster of glassy, metallic or pearly if the mineral is whats called dull the darkness of that mineral cannot obsorb the light like the brighter minerals can
The fluorescence in a mineral is where it will shine or reflect under a ultraviolet light.
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If light bounces off a mineral it has luster.
Luster-99.9% sure!
gives off light
light is needed to reflect an image off a mirror...no light no reflection