SPECTACULAR PLASTER CRYSTALS FROM POLAND IN MULTIFORMATION ON BASE. THIS PIECE HAS THE PECULARITY OF DOUBLE TWIN CRYSTALLIZATION. VERY GOOD SIZE PIECE FOR COLLECTORS. PIECE REMOVED IN POLAND.
Gypsum is a mineral composed of calcium sulfate.
It is a sedimentary rock of chemical origin. It is very common and can form sedimentary rocks.
Gypsum crystallizes in prismatic habit, tabular and rhombic shaped crystals with beveled edges. It appears in crystals, sometimes large and arrowhead or spearhead.
