mineral

Tumbled yellow-brown jasper

Microcrystalline quartz (SiO₂), commonly called jasper; exact variety cannot be confirmed from the image

AI-generated identification · may be incorrect

Opaque, mottled ochre-brown with a polished, vitreous-to-waxy surface; quartz has Mohs hardness 7 and trigonal crystal structure, though crystals are microscopic. No visible cleavage; specific gravity is about 2.6.

Identified October 16, 2026More mineral →

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Physical properties

Formation & geological history

Jasper forms as silica-rich fluids fill or replace rock, with iron and other impurities producing its colors. Its age and source cannot be determined from appearance alone.

Uses & applications

Commonly tumbled for jewelry, beads, and ornamental pieces; jasper is also used decoratively.

Geological facts

Jasper is an opaque variety of chalcedony, itself a microcrystalline form of quartz.

Field identification & locations

Look for opacity, hardness, and colored patterns; it commonly occurs in silica-rich volcanic and sedimentary settings worldwide. This polished pebble’s identity is suggestive, not definitive.