Silicon carbide is a rare but naturally occurring mineral found in microscopic crystals associated with some kimberlites. Natural crystals are named moissanite and man made crystals, such as these, are commonly called carborundum. Carborundum is produced commercially for use in abrasives and other industrial applications. However, these types of crystal formations are created under laboratory conditions for, lapidary, decorative display pieces and for other, metaphysical, purposes. This formation consists of parallel growths of prismatic and plate-like crystals. They have a brilliant iridescence and a metallic luster. This piece measures 4 1/4 x 1 5/8 x 1 inches or 10.8 x 4.1 x 2.5 cm.