According to the Mohs hardness scale, which of the given raw materials is the hardest?

calcite
orthoclase
fluorite
apatite
In the order of hardness: calcite (CaCO3), fluorite (CaF2), apatite (Ca5 (PO4) 3 (OH-, Cl-, F-), and orthoclase (KAlSi3O8).
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Answers by country

calcite
orthoclase
fluorite
apatite
answers
flagAustria
14%
61%
19%
4%
21
flagGreece
36%
45%
18%
0%
11
flagPoland
30%
43%
10%
16%
1377
flagthe United States
28%
32%
26%
11%
76
flagGermany
23%
27%
16%
32%
55
flagthe United Kingdom
44%
27%
5%
22%
18