mineral

Yellow jasper (likely polished/tumbled)

Microcrystalline quartz, SiO₂, colored by iron oxides; exact identification is uncertain from the image

AI-generated identification · may be incorrect

Opaque mustard-yellow to brown, smooth polished surface, vitreous to waxy luster; quartz hardness 7 Mohs, no cleavage, cryptocrystalline structure. Specific gravity is typically about 2.6.

Identified September 23, 2026More mineral →

Explore Yellow jasper (likely polished/tumbled) in the encyclopedia →

Identify your own rocks.

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

App Store Google Play

Physical properties

Opaque mustard-yellow to brown, smooth polished surface, vitreous to waxy luster; quartz hardness 7 Mohs, no cleavage, cryptocrystalline structure. Specific gravity is typically about 2.6.

Formation & geological history

Jasper forms when silica-rich fluids fill cavities or replace rock, with iron-bearing impurities producing yellow coloration. It occurs in varied geological settings and ages; the image does not establish a precise source or age.

Uses & applications

Used for beads, cabochons, carvings, and decorative objects; common polished pieces are mainly valued as collectibles.

Geological facts

Jasper is an opaque variety of chalcedony, itself microcrystalline quartz; yellow tones commonly result from iron compounds.

Field identification & locations

Look for opacity, fine-grained texture, and hardness sufficient to scratch glass; confirm with mineral tests, since other yellow stones can look similar. Jasper occurs worldwide, including in the United States, India, and Australia.