back
GYPSUM CaSO4·2H2O (monoclinic) . Canada . Selenite Rose∼occurs in rosette-shape aggregates,often incorporating grains of sand. 石膏成份為含水硫酸 鈣,晶體多作厚或薄板狀,珍珠光澤.硬度2.無色透明稱之為∼Selenite. 本礦由多片板狀結晶交叉成玫瑰狀.
@黃大 一 NO.582