mineral

Amethyst-bearing quartz

Quartz, SiO₂; purple variety colored mainly by iron-related defects

AI-generated identification · may be incorrect

Hardness 7 Mohs; translucent purple with gray-brown matrix, vitreous luster, hexagonal crystal structure, and no true cleavage (conchoidal fracture). The specimen appears to be a small rough crystal or vein fragment, possibly with quartz and iron-oxide inclusions.

Identified September 4, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich hydrothermal fluids fill cavities and fractures, commonly in volcanic rocks such as basalt or rhyolite; purple coloration develops through trace iron and natural irradiation. Individual deposits range from very old Precambrian formations to younger volcanic systems.

Uses & applications

Used as a jewelry and ornamental stone, in mineral collections, and for decorative carvings; this small matrix specimen is primarily a collector item.

Geological facts

Amethyst is the purple variety of quartz and is the birthstone for February. Heating can turn it yellow-orange, producing citrine or ametrine-like material.

Field identification & locations

Identify by its purple color, glassy luster, hardness sufficient to scratch glass, and commonly terminated quartz faces; verify with a loupe because lighting can exaggerate color. Major sources include Brazil, Uruguay, Zambia, and Mexico.