mineral

Tumbled orange-and-white chalcedony/agate

Microcrystalline quartz (SiO₂), likely iron-stained chalcedony or carnelian-bearing agate

AI-generated identification · may be incorrect

Small rounded, opaque-to-translucent specimen with orange-red patches and a creamy white matrix; vitreous to waxy luster, no obvious cleavage, Mohs hardness about 6.5–7, trigonal microcrystalline quartz structure, specific gravity about 2.6.

Identified August 15, 2026More mineral →

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Physical properties

Formation & geological history

Silica-rich groundwater filled cavities or fractures in volcanic rock, later developing iron-oxide coloration; commonly Cenozoic to older, depending on host rock. The pictured piece appears tumbled or naturally water-worn.

Uses & applications

Used for inexpensive cabochons, beads, carvings, ornaments, and lapidary collections; durable but not typically high-value jewelry material.

Geological facts

Orange color commonly comes from hematite or limonite inclusions. Agate is banded chalcedony, while irregularly colored nonbanded material is generally called chalcedony or jasper.

Field identification & locations

Common in volcanic terrains and alluvial gravels, including Brazil, Uruguay, India, Madagascar, Mexico, and the western United States; inspect for translucency, waxy luster, and absence of bubbles or glassy conchoidal fracture.