Question

1. the way a surface reflects light (shiny or dull)

color
streak
hardness
cleavage/fracture
hardness
luster

Explanation:

Luster is defined as the way a surface reflects light. It can be shiny (metallic luster) or dull (non - metallic luster). Color is the visual perception of different wavelengths of light. Streak is the color of a mineral in powdered form. Hardness is a measure of a material's resistance to scratching. Cleavage/fracture refers to how a material breaks.

Answer:

luster