mineral

Amethyst druzy geode fragment

Amethyst, purple variety of quartz (SiO₂), with druzy quartz crystals

AI-generated identification · may be incorrect

Hardness 7 Mohs; translucent to transparent purple-gray crystals with vitreous luster and hexagonal crystal structure. Quartz has no cleavage and uneven to conchoidal fracture; the yellow-brown outer rind may include iron oxides or host rock.

Identified September 30, 2026More mineral →

Explore Amethyst druzy geode fragment in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Formation & geological history

Silica-rich fluids deposited quartz crystals in a cavity or fracture; trace iron and natural irradiation produced the purple color. The specimen’s exact age and locality cannot be determined from the image.

Uses & applications

Collected as a mineral specimen and used decoratively; amethyst is also cut for jewelry, while quartz has broad industrial uses.

Geological facts

Druzy describes a coating of many tiny crystals lining a surface; amethyst’s color varies with iron impurities and irradiation.

Field identification & locations

Identify by its sparkling, pointed quartz crystals and purple hue, with hardness near 7; amethyst geodes occur in volcanic regions, notably Brazil and Uruguay. The image does not establish provenance.