mineral

Druzy agate pendant

Microcrystalline quartz (SiO₂), likely agate/chalcedony with druzy quartz crystals

AI-generated identification · may be incorrect

Cream, brown, and gray banded or mottled chalcedony with a sparkling rim of tiny quartz crystals; vitreous to waxy luster, trigonal quartz structure, Mohs hardness 6.5–7, no prominent cleavage. The image does not allow reliable measurement of specific gravity.

Identified September 29, 2026More mineral →

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Physical properties

Formation & geological history

Silica-rich fluids filled cavities in volcanic rock; chalcedony formed in layers and quartz crystals later grew on the cavity surface. Such agates form across many geological ages, commonly in Cenozoic volcanic terrains.

Uses & applications

Cut and polished as jewelry or decorative pieces; agate is also used for ornaments and, historically, precision components.

Geological facts

Druzy describes a coating of minute crystals lining a surface or cavity; the pendant setting appears to include small metallic-colored beads or trim.

Field identification & locations

Look for waxy translucent chalcedony, possible curved banding, and a glittering crystalline surface. Agates occur worldwide, including Brazil, Uruguay, Mexico, and the western United States; this small mounted piece is typically about $10–$50 USD, depending on workmanship and provenance.