B. Calcite, quartz, and topaz
C. Apatite, orthoclase, and corundum
D. Diamond, gypsum, and quartz
ANSWER
According to the Moh's hardness scale, the group of minerals that can scratch flourite are: APATITE, ORTHOCLASE AND CORUNDUM. The correct option is C. Moh's hardness scale is used to measure the resistance of a smooth surface to scratching. The scale ranges from 1 to 10, with talc having the hardness of 1, which is the softest and diamond having the value of 10, which is the hardest. All the three minerals listed in option C are above flourite in form of hardness so they can scratch fluorite.
