Before revision: The Rosiwal method (also called Delesse and Rosiwal) is basically a method of petrographic analysis and led to the development of the stereograph.Rosiwal method Rosiwal scale values Valor MOHSMineralRosiwal valueChemical composition Hardness 1 10 100 1,000 10,000 100,000 1,000,000 1 Talc****Mg3Si4O10(OH)2 2 Plaster******CaSO4 · 2H2O 3 Calcite**********CaCO3 4 Fluorite**********CaF2 5 Apatite***********Ca5(PO4)3(OH−,Cl−,F−) 6 Feldspar**************KAlSi3O8 7 Quartz****************SiO2 8 Topaz******************Al2SiO4(OH−,F−)2 9 Corundum********************Al2O3 10 Diamond********************************C {| class="wikitable"|-!Sr.No.
After revision: The Rosiwal method (also called Delesse and Rosiwal) is basically a method of petrographic analysis and led to the development of the stereograph.Rosiwal method Rosiwal scale values {| class="wikitable"|-!Sr.No.