Which one of these is NOT a
category of luster of a mineral?
A. metallic
B. sub-metallic
C. non-metallic
D. streak

Streak isn't a category for the luster of the minerals.

Luster is the property of a metal which marks the shiny and bright property of the metals. The elements are divided into two categories based on their shining property.

One class is very shiny and light can undergo direct reflection from its surface. They are the lustrous substances, mostly metals. They are said to have metallic luster.

The other group has the gross, greasy, waxy, pearly appearance which dont have any shiny property. They are said to have non metallic or submetallic luster.

answer: 4

explanation: 8