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 incorrectOpaque 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.
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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.
