Amethyst Quartz

Hardness: 7 on Mohs scale. Color: Pale lilac to deep purple, often with white quartz or matrix. Luster: Vitreous (glassy). Crystal Structure: Hexagonal (trigonal). Cleavage: None. Specific Gravity: 2.65.

Amethyst forms in hydrothermal veins, geodes, and cavities within igneous rocks. It crystallizes from silica-rich fluids at relatively low temperatures and pressures. The purple color is due to irradiation of iron impurities within the crystal lattice. Geological age varies widely depending on the deposit, ranging from hundreds of millions to tens of millions of years old.

Primarily used as a gemstone in jewelry (rings, necklaces, earrings), ornamental carvings, and decorative specimens for collectors. Lower quality or banded amethyst is sometimes used for industrial purposes.

Amethyst is the birthstone for February. It was once considered as valuable as diamonds and other precious stones. The largest amethyst geode, called the 'Empress of Uruguay', stands over 11 feet tall. In ancient cultures, amethyst was believed to prevent intoxication and ward off evil thoughts.

Identify in the field by its characteristic purple color, hexagonal crystal shape, and association with other quartz varieties or igneous host rocks. It's often found in vugs (small cavities) or larger geodes, sometimes with clear or milky quartz. Common locations include Brazil (Rio Grande do Sul), Uruguay, Siberia (Russia), Zambia, Canada, and the United States (North Carolina, Arizona).