mineral

Yellow Chalcedony (or Yellow Jasper / Agate)

Silicon Dioxide (SiO2)

AI-generated identification · may be incorrect

Hardness: 6.5-7 on Mohs scale; Color: Honey-yellow to butter-yellow; Luster: Waxy to resinous when polished; Crystal structure: Microcrystalline/trigonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.58-2.64.

Hardness: 6
Color: Honey-yellow to butter-yellow
Luster: Waxy to resinous when polished

Identified July 22, 2026More mineral →

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Physical properties

Formation & geological history

Formed from silica-rich fluid deposition at low temperatures in cavities, fractures, or sedimentary rocks over thousands to millions of years.

Uses & applications

Polished into cabochons for jewelry, beads, lapidary carvings, and collected as decorative polished stones.

Geological facts

Microcrystalline quartz includes agate, jasper, and chalcedony. The yellow hue is typically produced by trace amounts of iron oxides embedded within the cryptocrystalline quartz structure.

Field identification & locations

Identified by its waxy luster, smooth polished round surface, yellow translucency/opacity, and high scratch resistance (will scratch glass). Commonly found in Madagascar, Brazil, India, and the USA.