mineral

Tumbled jasper (likely picture jasper)

Jasper, an opaque microcrystalline variety of quartz (SiO₂); exact variety uncertain from the photo

AI-generated identification · may be incorrect

Mustard-yellow to brown stone with dark, irregular patterning and a smooth tumbled surface; quartz hardness 6.5–7 Mohs, vitreous to dull luster, trigonal crystal structure at microscopic scale, and no obvious cleavage. Specific gravity is about 2.6.

Identified October 2, 2026More mineral →

Explore Tumbled jasper (likely picture jasper) in the encyclopedia →

Identify your own rocks.

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

App Store Google Play

Physical properties

Formation & geological history

Silica-rich fluids or sediments became silicified, with iron oxides contributing the yellow-brown color; the material may be Precambrian, but age cannot be determined from appearance. Tumbling is human processing and does not change its geological classification.

Uses & applications

Used for beads, cabochons, ornamental objects, and inexpensive collected specimens; not typically used as a major construction material.

Geological facts

Jasper is an opaque form of chalcedony, and its varied patterns reflect mineral impurities and inclusions.

Field identification & locations

Look for opaque, fine-grained silica with no visible crystal faces and hardness sufficient to scratch glass; similar patterned jasper occurs in many regions worldwide. The image does not establish a precise locality or variety.