A minerals luster is produced by its ability to transmit light. Opaque minerals always have a metallic luster because they do not transmit any light. True False

The above statement is incorrect. The luster in minerals is not because of the their ability to transmit light but the ability to reflect light from their surface. More, the clean or polished the surface would be more light they would reflect.

Moreover, opaque minerals do not transmit light, they reflect it back into our eyes that is why we can see them. So, this correct.