mineral

Druzy agate/geode (likely seam agate with quartz)

Microcrystalline quartz (chalcedony), SiO₂, with crystalline quartz druse and iron-oxide matrix

AI-generated identification · may be incorrect

Hardness 6.5–7 Mohs; blue-gray translucent chalcedony cavity with sparkling quartz crystals and cream-brown banded matrix. Waxy to vitreous luster; trigonal quartz structure; no prominent cleavage; specific gravity about 2.6.

Identified August 21, 2026More mineral →

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At a glance

Common name: Druzy agate/geode (likely seam agate with quartz)
Scientific name: Microcrystalline quartz (chalcedony), SiO₂, with crystalline quartz druse and iron-oxide matrix
Category: mineral
Identified: August 21, 2026
Method: Standard

AI Estimated Value

About $10–$50 for a common hand specimen; $50–$150 or more if unusually large, strongly patterned, naturally vivid, and well-polished.

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

Silica-rich groundwater filled cavities or fractures in volcanic rock, depositing layered chalcedony followed by quartz crystals. The exact geological age cannot be determined from the photograph; such agates commonly form in Cenozoic volcanic terrains.

Uses & applications

Used as a decorative specimen, cabochon, ornamental stone, and jewelry material; agate is also used for carvings and polished slabs.

Geological facts

The concentric cream-brown layers are characteristic of agate, while the glittering cavity lining is druzy quartz. Blue coloration may be natural chalcedony or enhanced by treatment, which is common in commercial specimens.

Field identification & locations

Identify by testing hardness against glass, observing waxy chalcedony and quartz sparkle, and checking for curved/concentric banding. Common sources include Brazil, Uruguay, Mexico, Madagascar, and the western United States.