16. Which mineral is used in the production of aluminum?
a) Hematite
b) Bauxite
c) Halite
d) Calcite
Answer: b) Bauxite
17. Which mineral is commonly used in the production of jewelry?
a) Quartz
b) Calcite
c) Halite
d) Gypsum
Answer: a) Quartz
18. Which mineral is the primary source of manganese?
a) Hematite
b) Pyrolusite
c) Calcite
d) Halite
Answer: b) Pyrolusite
19. Which mineral is used in the production of insulation materials?
a) Gypsum
b) Halite
c) Calcite
d) Asbestos
Answer: d) Asbestos
20. Which mineral is used as a source of potassium for fertilizers?
a) Apatite
b) Gypsum
c) Halite
d) Sylvite
Answer: d) Sylvite