Fluorite from southern China, "always fits" 4mm bullet bracelet.

Fluorite has been used for centuries as a fluxing agent to more easily melt metals from ore and allow slag to run off better. For that reason, fluorite is also called fluorspar. Fluorite can have all kinds of colors: white, yellow, orange, pink, brown, green, blue, purple and transparent. The crystal shape is clearly visible: usually a regular octahedron. These facts make the mineral attractive to collectors. The phenomenon of fluorescence is named after this gemstone. It was discovered when working on metal that fluorite glows in the dark, if it had previously been in daylight. The element fluor, discovered in 1886, also takes its name from fluorite. Fluorite is a real study and thinking stone. It helps to see broad lines in the study material and to make connections with existing knowledge. This makes the information easier to organize and the material can be better absorbed. This mineral brings you to your core in a gentle, yet fast way. It brings out the best in you, both physically and mentally. Because fluorite comes in so many colors, it was and is often used to imitate other gemstones.