mineral
Yellow Agate
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness 6.5-7 on the Mohs scale; Color: honey yellow to amber; Luster: vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: none; Specific gravity: approx 2.6.
- Color
- honey yellow to amber
- Luster
- vitreous to waxy
Identified More mineral →
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Physical properties
Hardness 6.5-7 on the Mohs scale; Color: honey yellow to amber; Luster: vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: none; Specific gravity: approx 2.6.
Formation & geological history
Forms primarily in volcanic and metamorphic rocks as a result of silica-rich groundwater filling cavities (vugs). Age varies but can date back millions of years depending on the host rock formation.
Uses & applications
Commonly used in jewelry, ornamental carvings, tumbling/polishing for collectors, and historically for making burnishing tools.
Geological facts
Agate is a variety of chalcedony. The yellow coloring is often caused by the inclusion of iron oxides or hydroxide minerals within the silica structure.
Field identification & locations
Identify by its translucent nature, waxy luster, and conchoidal fracture. Commonly found in riverbeds or volcanic regions in Brazil, India, and the USA.
