In Moh's Scale of Hardness, if Talc is number one, what is number two?
CaSO4·2H2O GYPSUM Gipsum CaSO4*2H2O Gypsum Calcium sulfate dihydrate
caso4·2h2o gipsum gypsum caso4 2h2o calcium sulfate dihydrate
gypsum
WikipediaEntity
GYPSUM