Question

1. how a mineral looks in natural lighting

color
streak
hardness
cleavage/fracture
hardness

Explanation:

The color of a mineral refers to how it appears in natural lighting. Streak is the color of the powder when the mineral is scratched. Hardness is about how resistant a mineral is to being scratched. Cleavage/fracture relates to how a mineral breaks. Since the question is about the appearance in natural lighting, color is the relevant property.

Answer:

color