Which of the following is an example of a nonmetallic mineral?
a. sulfur
b. lead
c. aluminum
d. gold

The correct answer is:

a. sulfur

nonmetallic mineral is basically something that is not of a metallic quality.

Explanation:

Nonmetallic minerals are a special group of chemical elements from which no further product can be produced if they are blended. Nonmetallic minerals are, for example, sand, gravel, limestone, clay, and marble. Such materials lack metallic characteristics like great electric and thermic conductivity, brilliance, rigor, and malleability; they are, though, required for many industries.

the positions which points up in upward carbon and down in downward carbon are axial

and vice versa holds true for equatorial positions

so the correct answer with labelled diagram will be