Quartz is a mineral resource with very stable physical and chemical properties. It mainly refers to a wide range of trigonal low-temperature quartz (α-quartz). When the temperature is 573 ° C or more, it becomes a hexagonal high-temperature quartz (β-quartz). Low-temperature quartz crystals often have a hexagonal column with a pointed top. There are horizontal stripes on the cylinder surface, which are different from left-shaped crystals and right-shaped crystals. Double crystals are common, the most common being dow and twins. Usually in the form of a crystal or granular, massive aggregate. Top ten brands of quartz stone: First: Han Stone Second : Haishu Third : Omega (OMIK) Fourth : Sannoston Fifth : PKL (Korean brand) Sixth : Bao Guanglong (Guangzhou, China) Seventh : special dishes (original unknown) Eighth : Kang Park (Hong Kong brand, origin Beijing, China) Ninth : BITTO (Italian brand, originating in Shenzhen, China) Tenth : Beverly (Guangzhou, China) More jewelry brands are in China Jewelry Merchants Network! Novelty Socks,Cotton Nosvelty Sock,Sweat-Absorbent Tube Socks,Non Slip Knitted Socks Shaoxing Evergreen Knitting Co., Ltd. , https://www.egsock.com