Fluorite: Common colors: green, blue, brown, yellow, pink, purple, colorless, etc. Black and dark blue are often heat-treated into blue, which is stable, avoiding heating above 300℃. It is difficult to detect when fluorite is added in steel smelting. Fluorite can improve the fluidity of molten metal and remove harmful impurities such as sulfur and phosphorus.

The chemical composition is CaF2, and the crystal belongs to an isometric halide mineral, which emits blue or purple fluorescence under ultraviolet rays, cathode rays or heating, hence the name. Crystals are often cubes, octahedrons or cubes with twins, and the aggregate is granular or massive. Light green, light purple or colorless and transparent, sometimes with rose red and white stripes, with glass luster, transparent to opaque. Octahedral cleavage is complete. Mohs hardness 4, specific gravity 3. 18. Fluorite mainly occurs in hydrothermal veins. Colorless and transparent fluorite crystals occur in caves of granite pegmatite or fluorite veins. The total reserves of fluorite in the world are about 654.38 billion tons, and China is one of the countries with the largest fluorite minerals in the world, accounting for 35% of the world's reserves. According to archaeological excavations, Hemudu people in Yuyao, Zhejiang Province chose fluorite as an ornament 7000 years ago. There is indeed a fluorite mine in the south of Hemudu. Location: Zhejiang, Hunan, Fujian and other places. Other major producing areas in the world are South Africa, Mexico, Mongolia, Russia, the United States, Thailand, Spain and other places. Fluorite can be used as a flux in metallurgical industry and as a raw material for manufacturing hydrofluoric acid in chemical industry.

Wuyi fluorite has also increased in price now. But I bought some fluorite myself in Guo Dong, and the price was reasonable.

The first fluorite shop in Qiaotou, Guodong, Wuyi, sells the most reasonably and the proprietress is the most talkative.