PowerPoint Presentation An Introduction to Mineral ...
Coatings Industries in the 1920s. Paint R D Laboratory has been in existence since ... more damaging to process equipment than softer ... Mohs Hardness Scale 1 Talc 2 Gypsum 3 Calcite 4 Fluorite 5 Apatite 6 Feldspar 7 Quartz 8 Topaz 9 Corundum 10 Diamond 129 21 48 72 100 200 400 1500 0 100 200 300 400 500 600 700 800 900 1000 1100 1200 1300 ...