Amethyst

Hardness: 7 (Mohs scale); Color: Pale lilac to deep purple, often with color zoning; Luster: Vitreous (glassy); Crystal Structure: Hexagonal; Cleavage: None; Specific Gravity: 2.65

Amethyst forms in volcanic rocks (often in geodes and vugs) and sometimes in hydrothermal veins. It forms from the crystallization of silica-rich fluids at relatively low temperatures. The purple color is attributed to irradiation and the presence of trace amounts of iron. Geological Age: Varies widely, found in formations from Precambrian to Cenozoic.

Primarily used as a gemstone in jewelry (rings, necklaces, earrings, bracelets). Also popular for collectors, ornamental carvings, and decorative items. Historically, it was used for intaglios and cameos. Has purported metaphysical properties, believed to bring calm, balance, and peace.

The name 'amethyst' comes from the Greek word 'amethystos,' meaning 'not drunken,' as it was believed to protect its wearer from intoxication. It is the birthstone for February. Large deposits were discovered in Brazil in the 19th century, making it more widely available.

Identification in the field typically involves observing its characteristic purple color, vitreous luster, and hardness (it can scratch glass). It's commonly found in igneous rocks such as basalt flows and granites, often in druzy crystalline forms lining cavities. Major sources include Brazil, Uruguay, Russia, South Korea, Zambia, and the United States (North Carolina, Georgia).