mineral

Polished agate (likely carnelian/chalcedony)

Microcrystalline quartz, SiO₂; chalcedony, possibly iron-stained orange

AI-generated identification · may be incorrect

Hardness 6.5–7 Mohs; orange, cream, and translucent pink tones, with a waxy to vitreous luster and no visible cleavage. The small specimen appears naturally banded or mottled and polished.

Identified October 13, 2026More mineral →

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Physical properties

Hardness 6.5–7 Mohs; orange, cream, and translucent pink tones, with a waxy to vitreous luster and no visible cleavage. The small specimen appears naturally banded or mottled and polished.

Formation & geological history

Agate forms as silica-rich fluids fill cavities in volcanic rock, depositing chalcedony in layers over time. Its exact geological age and locality cannot be determined from the image.

Uses & applications

Used for beads, cabochons, small carvings, and collecting; agate is also used for decorative objects and historically for precision instrument components.

Geological facts

Agate is a variety of chalcedony, itself a microcrystalline form of quartz; iron impurities can produce orange-red carnelian colors.

Field identification & locations

Look for translucent edges, waxy luster, and fine bands or mottling; hardness near 7 helps distinguish it from softer imitations. Agates occur worldwide, especially in volcanic regions and river gravels.