mineral
Agate
Cryptocrystalline quartz, SiO2
AI-generated identification · may be incorrectHardness: 6.5-7 on Mohs scale. Color: Highly variable, this specimen is beige, white, and orange/brown. Luster: Waxy to vitreous. Crystal structure: Cryptocrystalline. Cleavage: None. Specific gravity: 2.58-2.64.
- Hardness
- 6
- Luster
- Waxy to vitreous
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Physical properties
Hardness: 6.5-7 on Mohs scale. Color: Highly variable, this specimen is beige, white, and orange/brown. Luster: Waxy to vitreous. Crystal structure: Cryptocrystalline. Cleavage: None. Specific gravity: 2.58-2.64.
Formation & geological history
Forms in cavities of eruptive rocks or ancient lavas. Silica-rich fluids fill the cavities and deposit microscopic layers of quartz over millions of years.
Uses & applications
Used in jewelry, carved ornaments, and collected by rockhounds. Sometimes used industrially for precision pendulums or mortar and pestles due to its hardness.
Geological facts
Agate is named after the Achates River (now Dirillo) in Sicily, where it was first found. It is a variety of chalcedony.
Field identification & locations
Identified by its banded or patterned appearance and waxy luster. Commonly found worldwide, especially in volcanic areas. Collectors often look for unique patterns and banding.
