The mineral quartz is perhaps the most significant and prolific on the planet. It can be found in practically every natural formation and is present in at least some rock types. It's constructed of trigonal crystalline silica and has a hexagonal geometry. In terms of variety, colours, and forms, it is the most diversified.

The most fundamental contrast between the two forms of quartz is that one is macrocrystalline, which consists of solitary crystals apparent to the naked vision, another is microcrystalline or cryptocrystalline, which consists of clusters of crystals detectable only under extreme optical zoom. Cryptocrystalline quartz is referred to as chalcedony. The cryptocrystalline kinds are either translucent or somewhat opaque, while the subtle variants are macrocrystalline.