Hardness
		Moh's Hardness Minerals Absolute Hardness Simple Equivalents 1 talc 0.03 2 gypsum 1.25 fingernail easy 3 calcite 4.50 copper coin 4 flourie 5.00 knife blade easy 5 apatite 6.50 knife blade tough 6 orthoclase 37.00 steel file 7 quartz 120.00 will scratch window glass 8 topaz 175.00 9 corundum 1,000.00 10 diamond 140,000.00