It has been found that there are more than 30 kinds of zirconium- containing minerals, among which industrially valuable are mainly zircon and oblique zirconium. Since zirconium and hafnium are very similar in chemical properties, ions and atomic radii, both zirconium and hafnium exist in a symbiotic state in nature. The enamel itself has no independent minerals, and all of them are metamorphosed in the zircon. The zircon minerals with higher strontium are: crystallite, seedling stone, hydrozircon and so on. The main zirconium and niobium minerals are shown in the table below Table zirconium and rhenium minerals mineral Chemical formula ZrO 2 % HfO 2 % Density g∕cm 3 hardness colour Oblique zirconium ore (baddeleyfie) ZrO 2 80~98 0.5 to 2 6.5~6 6 to 6.5 White, red, yellow Zircon (zircon) ZrSiO 4 61～67 1~1.8 4.2 to 4.9 7.5 Colorless, yellow, green, brown, black, etc. Zirconate thorium (zirkelite) (Ca, Fe, Ti, Zr, Th) 2 O 3 52 1 to 2.7 4.7 5.5 Black, dark brown Quitelite Variant zircon TR, U, Th, etc. 52.40 5.5~17 4.1 6 brown Water zircon (malacone) Variant zircon containing Al, Ta, Nb, Th, U, H 2 O 53.2~65.1 3.7 to 4.6 3.89~3.93 6 colorless Seedling stone (nacgitc) Variant zircon containing TR, Ta, Nb, Th, U, etc. 49.8 3.5~7 4.1 7.5 Green, brown We supply all kinds of cloth cutting machines, including hand-held cloth cutting machine, fabric end cutting machine, hot and cold webbing cutter, automatic rolling cutting machine and so on, which can be widely used to cut cloth, leather, cotton textiles and other similar materials. According to the cutting shape, it can be divided into straight cutting, bevel cutting, rolling cutting and special shaped cutting. Our cutting machines are widely used in the field of clothing. Fabric cutting machine, Round Knife Cloth End edge Cutter, Apparel Fabric Roller blinds End Cutting Table Machine, Cloth end cutter, round knife cutter Suzhou Flying Man Assembly Automation Co., Ltd. , https://www.zjflyingman.com