gemstone

Amethyst crystal point

Quartz, silicon dioxide (SiO₂), purple variety colored chiefly by iron impurities and irradiation

AI-generated identification · may be incorrect

Mohs hardness 7; translucent purple, with a vitreous luster and trigonal crystal structure. Quartz has no true cleavage, conchoidal fracture, and specific gravity about 2.65; this specimen is polished/carved into a six-sided point.

Identified September 4, 2026More gemstone →

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Physical properties

Formation & geological history

Amethyst forms mainly in volcanic cavities when silica-rich fluids deposit quartz over millions of years, commonly during the Mesozoic to Cenozoic. Its purple color develops from trace iron and natural radiation.

Uses & applications

Used as a decorative crystal, lapidary specimen, jewelry, and ornamental carving; it has modest commercial value unless color and clarity are exceptional.

Geological facts

Natural amethyst crystal points typically show six-sided prism faces and pyramid terminations, whereas this evenly shaped point appears cut or polished. Heating can turn amethyst yellow-orange, producing citrine.

Field identification & locations

Common sources include Brazil, Uruguay, Zambia, and Mexico. Identify it by purple quartz hardness, glassy luster, lack of cleavage, and resistance to scratching by steel; glass or fluorite is softer.