questionedithistorytranslations

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added by Ts Dec. 23, 2017, 11:02 a.m.
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).
Ts
0
Correct this question
2
Very interesting!
reach: rather globalminerals

Votes

+1 Very interesting!  olorion
+1 Very interesting!  Ninjai
      Acceptable  th3pizgat0r