Question

question 5
why might two people describe a minerals luster differently?
luster depends on the time of day
luster determination is subjective
only experts can determine true luster
luster changes over time

Explanation:

Luster is the way a mineral reflects light. Perception of how light is reflected can vary from person - to - person as it is a subjective quality. It's not dependent on time of day, not only for experts to determine, and doesn't change over time in the context of different people's immediate descriptions.

Answer:

Luster determination is subjective