mineral

Amethyst geode

Amethyst, purple variety of quartz (SiO₂), lining a geode

AI-generated identification · may be incorrect

Violet, vitreous crystals with hexagonal crystal structure; Mohs hardness 7, no cleavage, conchoidal fracture. The host is likely a hollow cavity in volcanic rock.

Identified October 15, 2026More mineral →

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Physical properties

Violet, vitreous crystals with hexagonal crystal structure; Mohs hardness 7, no cleavage, conchoidal fracture. The host is likely a hollow cavity in volcanic rock.

Formation & geological history

Quartz crystals formed as silica-rich fluids deposited minerals inside a cavity, with trace iron and natural irradiation producing the purple color. Geodes occur in volcanic rocks of varied ages; the image alone cannot establish this specimen’s age or locality.

Uses & applications

Used for mineral collecting, décor, and jewelry; smaller crystals may be cut or polished.

Geological facts

Amethyst color ranges from pale lilac to deep purple and can fade with prolonged heat or sunlight.

Field identification & locations

Identify by purple, six-sided quartz crystals lining a geode cavity; prominent sources include Brazil and Uruguay. Value varies with size, color, crystal quality, and provenance.