Mineral Co | Gypsum
Gypsum is very soft at 2 on Mohs'' hardness scale. It is so soft that a fingernail can easily scratch it. Gypsum crystals can be a number of attractive colors, ranging from completely colorless to tan and even green. Sedimentary gypsum is nearly always white or gray in color. Sedimentary gypsum is the gypsum that is mined as a commodity.