mineral

Polished banded agate (likely)

Microcrystalline quartz, SiO₂ (chalcedony with iron-oxide and other mineral bands)

AI-generated identification · may be incorrect

Typically Mohs hardness 6.5–7, waxy to vitreous luster, opaque to translucent, with curved or irregular brown, black, gray, and cream banding. The image is blurred, so exact identification and properties are approximate.

Identified August 19, 2026More mineral →

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Physical properties

Formation & geological history

Agate forms when silica-rich groundwater fills vesicles in volcanic rock, depositing chalcedony and quartz in successive bands. Individual specimens may range from Paleozoic to recent volcanic settings.

Uses & applications

Used for cabochons, beads, carvings, ornamental objects, and lapidary collections; durable polished pieces are also used as decorative stone.

Geological facts

Distinctive concentric or plume-like banding results from changing fluids, impurities, and crystallization conditions during cavity filling.

Field identification & locations

Inspect a fresh or polished surface for fine parallel/curving bands, translucency at thin edges, and hardness sufficient to scratch window glass; common sources include Brazil, Uruguay, Mexico, India, Madagascar, and the United States.