Crystals are frequently combinations of octahedrons and cubes, and dodecahedral growths are sometimes present, forming complex and interesting crystals. Cleavage marks are present on basically all crystals. Cleavage fragments from large crystals are also found. From octahedrons, the cleavage fragments are flat, triangular shaped pieces. Cubic cleavage fragments are flat, three dimensional rectangles.
Crystals frequently form penetration twins , where one cube is intergrown in another.
Also occurs as clusters of intergrown cubes, grainy , and massive . Fluor Varieties Blue John - Banded purple and white or purple and yellow variety of Fluorite. Chlorophane - Variety of Fluorite that is thermoluminescent , emitting bright green light when heated. Yttrofluorite - Variety of Fluorite in which yttrium partially replaces the calcium in its structure. 2 Antozonite - Variety of Fluorite containing uncombined fluorine ions .