mineral
Yellow Agate
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness (Mohs): 6.5-7; Color: Yellow, cream, amber, and translucent white; Luster: Waxy to vitreous; Crystal Structure: Trigonal (Microcrystalline); Cleavage: None; Specific Gravity: 2.6
- Color
- Yellow, cream, amber, and translucent white
- Luster
- Waxy to vitreous
Identified More mineral →
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Physical properties
Hardness (Mohs): 6.5-7; Color: Yellow, cream, amber, and translucent white; Luster: Waxy to vitreous; Crystal Structure: Trigonal (Microcrystalline); Cleavage: None; Specific Gravity: 2.6
Formation & geological history
Formed in volcanic or sedimentary rocks as silica-rich groundwater fills cavities, slowly precipitating out layers of microcrystalline quartz or chalcedony. This specimen specifically looks like a river-tumbled or water-worn chalcedony/agate pebble.
Uses & applications
Used in gemstone carvings, jewelry (pendants, beads), decorative tumbled stones, and as a collector's specimen.
Geological facts
Agate is a variety of chalcedony characterized by its translucency and delicate banding. The yellow hue is typically caused by inclusions of iron oxides such as geothite or limonite.
Field identification & locations
Identify by its waxy luster, translucency when held to a light source, and lack of visible crystalline structure compared to quartz. Common in gravel pits, riverbeds, and beach deposits across the globe.
