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
Austria
21
Greece
11
Poland
1375
the United States
76
Germany
53
the United Kingdom
18