In 'Moh's Scale' of hardness, Talc is at number 1, but what is number 2?
CaSO4·2H2O GYPSUM Gipsum CaSO4*2H2O Gypsum Calcium sulfate dihydrate
gipsum caso4 2h2o calcium sulfate dihydrate caso4·2h2o gypsum
gypsum
WikipediaEntity
GYPSUM