gemstone

Tumbled amethyst quartz point

Amethyst, purple quartz (SiO₂)

AI-generated identification · may be incorrect

Likely Mohs hardness 7; purple vitreous luster, translucent body, and conchoidal fracture. The visible faceted/pointed shape appears cut and polished rather than naturally terminated; color is caused mainly by iron impurities and irradiation.

Identified September 15, 2026More gemstone →

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Physical properties

Formation & geological history

Forms in cavities and geodes of volcanic rocks when silica-rich fluids deposit quartz, commonly during the Mesozoic to Cenozoic in major deposits. The specimen has been human-shaped and polished.

Uses & applications

Used for inexpensive jewelry, carvings, ornaments, and mineral collections. Small polished points commonly have modest retail value.

Geological facts

Amethyst is the purple variety of quartz and is February’s birthstone. Heating can change its color to yellow-orange citrine or produce ametrine in suitable material.

Field identification & locations

Identify by purple quartz color, glassy luster, hardness, and lack of cleavage; it should scratch glass but not be scratched by a steel knife. Common sources include Brazil, Uruguay, Zambia, and Bolivia; exact origin cannot be determined from the image.