gemstone

Tumbled jasper and agate

Microcrystalline quartz (SiO₂), likely jasper/chalcedony; exact varieties cannot be confirmed from the image

AI-generated identification · may be incorrect

Polished, opaque to slightly translucent red and cream pieces with a waxy-to-vitreous luster. Quartz hardness is about 7 Mohs; crystals are microscopic and cleavage is absent.

Identified September 25, 2026More gemstone →

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Physical properties

Polished, opaque to slightly translucent red and cream pieces with a waxy-to-vitreous luster. Quartz hardness is about 7 Mohs; crystals are microscopic and cleavage is absent.

Formation & geological history

Silica-rich fluids filled cavities or fractures, later forming chalcedony and iron-oxide-colored jasper; geological age and locality are not determinable from appearance alone.

Uses & applications

Commonly tumbled for decorative display, beads, cabochons, and small craft pieces.

Geological facts

Jasper and agate are varieties of chalcedony, a microcrystalline form of quartz; iron oxides commonly produce red hues.

Field identification & locations

Look for hardness near 7, a smooth polish, and—on agate—translucent bands. These stones occur worldwide, including Brazil, India, Madagascar, and the United States.