gemstone

Yellow Agate

Silicon Dioxide (Chalcedony), SiO2

Hardness: 6.5 to 7 on the Mohs scale; Color: Yellow, golden, translucent; Luster: Waxy to vitreous; Crystal structure: Trigonal (microcrystalline quartz); Cleavage: None, exhibits conchoidal fracture; Specific gravity: 2.58 to 2.64

Hardness: 6
Color: Yellow, golden, translucent
Luster: Waxy to vitreous

Identified August 6, 2026More gemstone →

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Physical properties

Formation & geological history

Formed in the cavities of volcanic and metamorphic rocks through the slow deposition of silica-rich groundwater solutions over millions of years.

Uses & applications

Widely used in making jewelry, ornamental carvings, polished specimens, and lapidary art.

Geological facts

Agates are among the most popular stones used in ancient healing and talismans. Yellow varieties often owe their color to iron oxide impurities trapped during formation.

Field identification & locations

Can be identified by its waxy luster, conchoidal fracture, and microcrystalline structure. Found worldwide, with notable deposits in Brazil, India, Madagascar, and the USA.