mineral

Polished agate beads

Agate, a banded variety of chalcedony (microcrystalline quartz, SiO₂)

AI-generated identification · may be incorrect

Typically hardness 6.5–7 Mohs, vitreous to waxy luster, and no visible cleavage; these beads show translucent green, blue-gray, and white colors with cloudy or subtle banded patterns. Exact color may be natural or enhanced by dyeing.

Identified October 3, 2026More mineral →

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Physical properties

Formation & geological history

Agate forms as silica-rich fluids fill cavities in volcanic rocks, depositing microscopic quartz in layers. The beads are cut and polished from natural material; deposits formed across many geological ages, commonly in volcanic terrains.

Uses & applications

Used for beads, jewelry, ornaments, and small decorative objects; agate is also used for carvings and occasional laboratory or industrial components.

Geological facts

Agate is valued for its varied colors and patterns; chalcedony’s fine interlocking quartz crystals give it a smooth, durable polish.

Field identification & locations

Identify by its waxy luster, translucency, and curved or cloudy internal bands; common sources include Brazil, Uruguay, India, and Madagascar. These appear drilled for jewelry and may be color-treated.