Final answer:
Luster refers to the mineral's intensity of reflected light and can be classified as either metallic or non-metallic based on its interaction with light.
Step-by-step explanation:
The term that refers to a mineral's intensity of reflected light is luster. Luster describes how light interacts with the surface of a mineral, and it can be classified as either metallic or non-metallic. Metallic luster means that the mineral does not allow any light to pass through its atomic structure, whereas minerals with non-metallic luster do allow some light to pass through.
This is different from streak, which is the color of a mineral in powdered form, or hardness, which is a mineral's ability to resist scratching (based on Mohs' scale of mineral hardness), and cleavage, which pertains to how a mineral breaks along its structural planes.