There are many primary deposits in the purple tooth, mainly in a number of magmatic or metamorphic rocks, most of the gem-grade garnet found in alluvial sand. Purple tooth is a garnet mineral, is a more complex chemical composition of silicate minerals (island silicate), usually expressed in a3b2[sio4]3. Where a represents ca2+, mg2+, fe2+, mn2+ and other two valence cations, b means al3+, fe3+, cr3+ and other trivalent cations. The crystal morphology is a rhomboid 12-sided body, a four-angle 38-sided body or a polymer of both. The assembly is granular or lumpy. The color of garnet is influenced by ingredients and presents a variety of colors, including the red ' pink ' purple ' orange red; The yellow series includes the yellow ' orange ' yellow ' brown yellow; and the green series includes the verdant ' olive green ' yellow green. Crystal Surface display glass luster, ya King Kong Luster, fracture of oil luster. Transparent to translucent. Homogenous body, not multicolor, no birefringence phenomenon. Garnet can be divided into two series, six major varieties: Iron and Aluminum Garnet series (magnesium aluminum garnet, aluminum garnet, manganese aluminum garnet) and Calcium Iron Garnet series (Calcium chrome garnet, calcium aluminum garnet, calcium iron garnet).