Chalcedony

Chalcedony is a form of silica mineral, known for its waxy luster and variety of colors, used in jewelry making.

Part of speech: noun
Definition: Chalcedony is a cryptocrystalline form of silica, composed of very fine intergrowths of quartz and moganite. These minerals are both silica minerals, but they differ in that quartz has a trigonal crystal structure, while moganite is monoclinic. Chalcedony's standard chemical structure (based on the oxide: SiO2) and its mohs hardness of 6 to 7 make it durable enough for various types of jewelry. Traditionally valued for its translucence and array of colors, chalcedony can be found in blue, white, gray, and other shades. Often used in the production of cabochons, beads, and as the gemstone in brooches and pendants, chalcedony offers versatility and aesthetic appeal to jewelers and wearers alike. Notably, its diversity in color and pattern is due to the presence of trace minerals, which alter its appearance, resulting in a myriad of types and names, including agate, carnelian, and onyx.