Question

A mineral is scratched by apatite but not by calcite. What could its hardness value be?

(1 point)
Responses

1
1

2
2

4
4

6

Answer 1

4

Apatite has Mohs hardness 5 and can scratch the mineral, while calcite (hardness 3) cannot — so the mineral's hardness is between 3 and 5, i.e., about 4 (fluorite).