The property that refers to the way light bounces off a mineral is called luster.

Here's a breakdown:

* Luster describes how light reflects off the surface of a mineral. It's a visual property that can help identify minerals.

* Types of Luster: There are many types of luster, including:

* Metallic: Shiny like a metal (e.g., pyrite, galena)

* Non-metallic: Not shiny like a metal, with various sub-types:

* Vitreous: Glassy (e.g., quartz)

* Adamantine: Brilliant, like a diamond (e.g., diamond)

* Resinous: Like resin or amber (e.g., amber, some sulfurs)

* Pearly: Like a pearl (e.g., some feldspars)

* Silky: Like silk (e.g., asbestos)

* Dull: No shine (e.g., clay)

* Earthy: Like soil (e.g., hematite)

So, when you're describing a mineral, "luster" is a key term to consider!