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19 June, 22:19

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

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  1. 19 June, 22:25
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    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
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