mineral

Tumbled jasper or chalcedony

Microcrystalline quartz (SiO₂), likely jasper/chalcedony

AI-generated identification · may be incorrect

Small polished, opaque-to-translucent tan-orange stone with a waxy to glassy luster and rounded edges. Hardness is about 6.5–7 Mohs; no visible cleavage, and specific gravity is approximately 2.6.

Identified August 23, 2026More mineral →

Explore Tumbled jasper or chalcedony in the encyclopedia →

Identify your own rocks.

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

App Store Google Play

Physical properties

Small polished, opaque-to-translucent tan-orange stone with a waxy to glassy luster and rounded edges. Hardness is about 6.5–7 Mohs; no visible cleavage, and specific gravity is approximately 2.6.

Formation & geological history

Formed when silica-rich groundwater deposited cryptocrystalline quartz, commonly replacing or filling cavities in volcanic or sedimentary rock. Its precise geological age and locality cannot be determined from the photograph.

Uses & applications

Used for inexpensive cabochons, beads, carvings, tumbling, and ornamental objects; jasper is also a popular lapidary material.

Geological facts

Jasper is opaque because of abundant iron oxides and other impurities, while chalcedony is typically more translucent. The warm coloration likely reflects iron staining.

Field identification & locations

Identify it by its very high hardness, lack of cleavage, waxy surface, and inability to scratch with a steel knife; a quartz crystal or glass may scratch it. Common sources include Brazil, Madagascar, India, Mexico, and the western United States.