mineral

Blue-green agate (likely tumbled and polished beads)

Microcrystalline quartz, chiefly chalcedony (SiO₂); exact variety cannot be confirmed from the photo

AI-generated identification · may be incorrect

Opaque to translucent blue-green beads with mottled white and dark patterns and a polished luster. Quartz hardness is 7 Mohs; trigonal crystal structure, specific gravity about 2.6; no obvious cleavage. Bead treatment or dye cannot be determined visually.

Identified October 1, 2026More mineral →

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Physical properties

Formation & geological history

Agate forms as silica-rich fluids fill cavities, commonly in volcanic rocks, and deposit chalcedony in layers. Its age depends on the source deposit; the beads have been shaped and polished by people.

Uses & applications

Used in jewelry and decorative objects; agate is also used for carvings and small ornamental items.

Geological facts

Agate’s fine, interlocking quartz fibers can produce banding or intricate moss-like inclusions; not all agates show distinct bands.

Field identification & locations

Look for waxy luster, hardness sufficient to scratch glass, and natural internal patterning; color alone is not diagnostic. Agate occurs worldwide, including Brazil, Uruguay, India, and the United States.