mineral

Iron-stained quartz/agate breccia (probable jasper specimen)

Microcrystalline quartz, SiO₂, with iron oxides/hydroxides and possible chalcedony

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; reddish-brown, cream, black, and honey-yellow patches; mostly vitreous to dull luster. Irregular brecciated texture with quartz/chalcedony filling fractures; cleavage absent and fracture conchoidal. Exact identification is limited by the small, unpolished image.

Identified September 1, 2026More mineral →

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Physical properties

Formation & geological history

Likely formed when silica-rich fluids cemented fractured volcanic or sedimentary rock, while iron-bearing minerals produced the red-brown and yellow staining. Such jasper/agate formation commonly ranges from Paleozoic to Cenozoic depending on locality.

Uses & applications

Used as a lapidary stone for cabochons, carvings, beads, and small polished specimens; attractive pieces are collected rather than used structurally.

Geological facts

The dark material may be manganese or iron oxides, while the yellow areas may be limonite or goethite. A glassy edge and conchoidal fracture support quartz content.

Field identification & locations

Common in volcanic terrains and silica-rich hydrothermal deposits worldwide, including the western United States, Brazil, Mexico, India, and Australia. It should scratch ordinary glass but not be scratched by a steel knife; avoid destructive tests on valuable pieces.