mineral

Yellow jasper (likely iron-stained chalcedony)

Jasper, an opaque microcrystalline variety of quartz (SiO₂), colored by iron oxides

AI-generated identification · may be incorrect

Mohs hardness 6.5–7; opaque yellow-orange with pale mottling, waxy to vitreous luster, and no visible cleavage. Quartz has a trigonal crystal structure, though jasper’s crystals are microscopic.

Identified October 13, 2026More mineral →

Explore Yellow jasper (likely iron-stained chalcedony) in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Mohs hardness 6.5–7; opaque yellow-orange with pale mottling, waxy to vitreous luster, and no visible cleavage. Quartz has a trigonal crystal structure, though jasper’s crystals are microscopic.

Formation & geological history

Silica-rich fluids deposited and lithified into microcrystalline quartz, with iron compounds producing the color; jasper forms in veins and sedimentary settings across many geological ages.

Uses & applications

Commonly cut and polished for cabochons, beads, carvings, and decorative objects; also collected as a lapidary stone.

Geological facts

Jasper is valued for its varied colors and patterns; yellow hues commonly result from iron oxides or hydroxides.

Field identification & locations

The smooth, opaque, mottled appearance and hardness are consistent with jasper, but a photo cannot confirm the identification. Jasper occurs worldwide, including India, Brazil, Madagascar, and the western United States.