mineral

Iron-stained jasper (likely orbicular/brecciated jasper)

Microcrystalline quartz, SiO₂, colored by iron oxides/hydroxides

AI-generated identification · may be incorrect

Opaque, mustard-yellow to red-brown with earthy patches and a glossy weathered surface; quartz hardness is about 6.5–7 Mohs, with no obvious cleavage and conchoidal fracture. The cavity may be a natural vug lined with drusy quartz or iron oxides.

Identified September 6, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids replace or cement volcanic and sedimentary material, while hematite/goethite create the yellow-red coloration; commonly Paleozoic to younger, depending on locality. The exact specimen cannot be dated from the image.

Uses & applications

Used as an ornamental stone, cabochons, carvings, lapidary material, and decorative objects; not generally used as aggregate when attractive.

Geological facts

Jasper is a variety of opaque chalcedony/microcrystalline quartz, and vivid colors commonly result from iron oxidation. The pictured piece may also be a weathered iron-rich silicified rock rather than pure jasper.

Field identification & locations

Identify by its opaque silica-rich body, glassy-to-waxy luster, high hardness, and inability to scratch with a steel knife easily; acid produces no fizz. Common sources include Oregon, Idaho, Arizona, Australia, Madagascar, and India.