mineral
Agate
Cryptocrystalline Quartz, SiO2
AI-generated identification · may be incorrectHardness: 6.5-7. Color: Banded with various colors (white, gray, blue, brown, red, yellow). Luster: Waxy to vitreous. Crystal structure: Trigonal. Cleavage: None. Specific gravity: 2.58-2.64.
- Hardness
- 6
- Luster
- Waxy to vitreous
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Physical properties
Hardness: 6.5-7. Color: Banded with various colors (white, gray, blue, brown, red, yellow). Luster: Waxy to vitreous. Crystal structure: Trigonal. Cleavage: None. Specific gravity: 2.58-2.64.
Formation & geological history
Forms in cavities of eruptive rocks or ancient lavas from siliceous solutions.
Uses & applications
Used in jewelry, ornaments, bookends, coasters, and as a collector's specimen.
Geological facts
Agate was named by Theophrastus, a Greek philosopher, who discovered the stone along the shoreline of the Achates River in Sicily.
Field identification & locations
Identified by its banding patterns and waxy luster. Found worldwide, particularly in Brazil, Uruguay, and the United States (Lake Superior, Oregon, etc.).
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