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).

Piotr Sosnowski

minerals

Minerals quiz

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Answers by country

Austria

14%

61%

19%

Greece

36%

45%

18%

Poland

30%

43%

10%

16%

1381

the United States

28%

32%

26%

11%

the United Kingdom

42%

31%

21%

Germany

24%

26%

17%

31%

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