Natural Minerals

66. Which mineral is commonly used in the production of semiconductors?
a) Quartz
b) Feldspar
c) Diamond
d) Graphite

67. Which mineral is the primary source of silver?
a) Hematite
b) Galena
c) Calcite
d) Halite

68. Which mineral is used in the production of soaps and detergents?
a) Gypsum
b) Halite
c) Calcite
d) Pyrite

69. Which mineral is commonly used in the production of cemented carbides?
a) Quartz
b) Diamond
c) Tungsten carbide
d) Feldspar

70. Which mineral is commonly used as a gemstone?
a) Apatite
b) Quartz
c) Pyrite
d) Barite