hardness of rock phosphate for grinding
Phosphate Rock Mohs Hardness Cromalinsupport. Hardness Of Rock Phosphate For Grinding MillsMining Equipment The main test of apatite is by its hardness which is a 5 on the Mohs scale 9 specimens Talc Gypsum Calcite Flourite Apatite Feldspar Quartz Beryl and Corundum In 1812 a German mineralogist by the name of Friedrich Mohs developed a scale of hardness based upon a harder