Wait, why? Personally, I think that silicon itself is a simple substance with high hardness and good transparency, so most of silicon oxide SIO2 (crystal) and silicate are substances with high hardness and high transparency that meet the requirements of gemstones. In addition, it also contains rich chromogenic metal ions, which make the formed substance have good hardness, transparency and colorful colors, and constitute several major elements of gems, so it is deeply loved by people! 2. Tremolite can be used for mining and selecting tremolite deposits. There are three known genetic types of deposits in China: ① Mg-carbonate regional metamorphic tremolite deposits, which are formed by Paleozoic marine siliceous and dolomite deposits through regional metamorphism. The seam is sandwiched between quartz schist, amphibole schist and dolomite marble, hundreds to thousands of meters long, hundreds of meters deep and several to twenty meters thick, and sometimes talc appears. The ore is massive, banded, granular, columnar, fibrous and columnar. Tremolite is often associated with diopside, and the ore content is 70% ~ 90%, including calcite, talc and serpentine. Such as the watershed in Shangxian County, Shaanxi Province, and the tremolite deposit in Fanche Mountain, Panshi, Jilin Province. ② The magnesium skarn-type contact metamorphic tremolite deposit occurs in the near-surface suture zone and is formed by contact alteration of magnesium marble captured by intermediate-acid magma. In Chinese mainland, it was produced in Yuanguyu, while in Taiwan Province Province of China, it was produced in Paleozoic-Mesozoic. The ore body is veined and lenticular, several meters to ten meters long and dozens of centimeters thick. The surrounding rocks have strong tremolite, serpentine and silicified alteration. The minerals are jade white, light blue and light green, slightly transparent and translucent, with waxy luster, dense block structure and fiber felt metamorphic structure. Minerals include tremolite (above 85%), actinolite and a small amount of diopside, serpentine, zoisite and chlorite. Such as tremolite deposits in Datong Township, Tashkurgan County, Xinjiang, Alamas, yutian county, Taiwan, Shoufeng Township, Hualien, and Lin Xiu Township, Taiwan Province, and tremolite actinolite deposit (Longxiyu) in Longxi Township, Wenchuan, Sichuan. (3) ultrabasic rock-type contact metamorphic tremolite deposits, such as Nanshan tremolite deposit in Manas, Xinjiang, are formed by ultrabasic magma capturing Devonian-Carboniferous intermediate-basic volcanic rocks and contacting with low-iron actinolite. The ore body is lenticular and wedge-shaped, with a maximum of 12m, generally 1 ~ 10m and a width of1.3m. The surrounding rocks are altered by serpentine, chlorite and tremolite. The ore is the famous "Manas Jasper", which is green, blue-green, translucent and delicate. Mainly composed of tremolite, including actinolite and chlorite. Tremolite jade belongs to nephrite. According to the content of iron oxide, its color varies from dark green to nearly colorless, and jade is bright and smooth, which is a famous jade carving material. Tremolite, as an industrial raw material, mainly occurs in type I deposits, and it is an industrial mineral and deposit type discovered, explored and developed in China in 1980s. Its technological characteristics and uses are consistent with those of wollastonite, and it is widely used as ceramic raw materials, glass raw materials and various fillers for energy saving and production increase. As nephrite, it mainly occurs in type ② and type ③ deposits. 3. Organic gems, such as pearls, ivory, amber, tortoiseshell, etc. I hope it can be the answer. thank you