mineral

Amethyst crystal cluster

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

AI-generated identification · may be incorrect

Hardness 7 Mohs; vitreous luster; purple translucent crystals with hexagonal prismatic/trigonal structure and conchoidal fracture, lacking cleavage. Specific gravity is about 2.65.

Identified September 15, 2026More mineral →

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At a glance

Common name: Amethyst crystal cluster
Scientific name: Quartz, silicon dioxide (SiO₂), purple variety colored mainly by iron impurities and irradiation
Category: mineral
Identified: September 15, 2026
Method: Standard

AI Estimated Value

Typically $15–$100 for a hand-sized common cluster; vivid, large, well-formed or locality-specific specimens may sell for $150–$1,000+.

Not an official valuation

AI estimate for general interest only — not an appraisal. Actual value depends on condition, provenance, and market demand. Verify with a professional before buying, selling, or insuring.

This identification was generated by AI and may contain errors. Verify important details before relying on them — and never use an AI result to judge whether a specimen is safe to handle. Read the full disclaimer

Physical properties

Hardness 7 Mohs; vitreous luster; purple translucent crystals with hexagonal prismatic/trigonal structure and conchoidal fracture, lacking cleavage. Specific gravity is about 2.65.

Formation & geological history

Forms when silica-rich hydrothermal fluids or groundwater fill cavities in volcanic rocks, especially basaltic geodes; many deposits formed during the Cenozoic, though ages vary by locality.

Uses & applications

Used as a gemstone, ornamental specimen, and lapidary material; lower-grade material is used for carvings, polished pieces, and metaphysical décor.

Geological facts

The color can fade with prolonged heat or strong sunlight; natural amethyst commonly grades from pale lilac to deep violet, with crystal tips often showing color zoning.

Field identification & locations

Identify it by purple quartz crystals, glassy luster, and hardness sufficient to scratch ordinary glass; common sources include Brazil, Uruguay, Zambia, and Mexico. The pictured piece appears to be a natural drusy cluster on dark matrix.