Lustre refers to which property?

• A. Lustre is the measure of hardness
• B. Lustre is the ability to be stretched into a wire
• C. Lustre describes shininess or dullness
• D. Lustre is the tendency to dissolve

Answer: (C)

Lustre describes how light interacts with a surface, giving something its shininess or dullness. This is a visual property used to describe minerals and metals—the way a surface reflects light tells you if it looks shiny (like metals or glassy minerals) or dull (like many non-metallic surfaces). It’s not about how hard something is, how easily it can be stretched into a wire, or whether it dissolves in a solvent.