Question

Which substances are harder than apatite, but softer than corundum?

A.fluorite and quartz

B.topaz and quartz

C.diamond and quartz

D.talc and gypsum

Answer 1

Answer:

B. topaz and quartz

Explanation:

Hardness of a mineral is measured using Moh’s scale.

Hardness depends on the bonding attraction between the atoms and the size of the atoms present in the mineral

Mineral    Hardness(Moh’s)

Talc                              1

Gypsum                      2

fluorite                        4

Apatite                        5

Topaz                           8

quartz                          7

Corundum                   9

Diamond             10

Option B topaz and quartz  is the Answer