gemstone

Amethyst druzy on agate/geode matrix

Quartz, SiO₂; purple coloration from trace iron and irradiation, with chalcedony (microcrystalline quartz) matrix

AI-generated identification · may be incorrect

Hardness 7 Mohs; vitreous to sparkling druzy luster; purple quartz crystals lining pale gray-white banded chalcedony. Quartz is trigonal and lacks cleavage, with conchoidal fracture; specific gravity about 2.65.

Identified September 12, 2026More gemstone →

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At a glance

Common name: Amethyst druzy on agate/geode matrix
Scientific name: Quartz, SiO₂; purple coloration from trace iron and irradiation, with chalcedony (microcrystalline quartz) matrix
Category: gemstone
Identified: September 12, 2026
Method: Standard

AI Estimated Value

About $5–$30 for a small common specimen; $30–$100+ for larger, vividly colored, well-crystallized pieces.

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

Formation & geological history

Forms when silica-rich groundwater fills volcanic cavities, depositing chalcedony and later quartz crystals; commonly Cenozoic to Mesozoic in age depending on locality. The specimen appears cut or broken from a small geode.

Uses & applications

Used as a decorative gemstone, jewelry, crystal specimen, and ornamental slab; druzy pieces are popular for collecting and cabochons. It has little industrial value at specimen scale.

Geological facts

Amethyst’s purple hue is produced chiefly by iron impurities and natural radiation. Heating can turn some amethyst yellow-orange, producing citrine-like material.

Field identification & locations

Identify by purple transparent-to-translucent quartz crystals, sparkling drusy texture, and a harder-than-glass surface; it will not scratch quartz but can scratch glass. Common sources include Brazil, Uruguay, Mexico, Zambia, and Namibia.