PIECE OF PLASTER CRYSTALS IN THE SHAPE OF AN ARROW HEAD. THE WHOLE MATRIX FILLED WITH TOTALLY TRANSPARENT CRYSTALS. PIECE FOR COLLECTORS.
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.
The gypsum crystallizes in crystals with a prismatic, tabular and rhombic shape with beveled edges. It occurs in crystals, sometimes large and arrowhead or spearhead.
