mineral
Agate (specifically crazy lace agate / orbicular agate node)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
AI-generated identification · may be incorrectHardness: 6.5-7 on Mohs scale. Color: Tan, orange, cream, brownish-red with concentric orbicular/banded patterns. Luster: Waxy to vitreous. Crystal structure: Trigonal (microcrystalline). Fracture: Conchoidal. Specific gravity: ~2.6.
- Hardness
- 6
- Luster
- Waxy to vitreous
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Physical properties
Hardness: 6.5-7 on Mohs scale. Color: Tan, orange, cream, brownish-red with concentric orbicular/banded patterns. Luster: Waxy to vitreous. Crystal structure: Trigonal (microcrystalline). Fracture: Conchoidal. Specific gravity: ~2.6.
Formation & geological history
Formed through the deposition of silica from groundwater within cavities or gas vesicles in volcanic igneous rocks or sedimentary rocks, often forming concentric rings, eyes, or complex lace patterns during slow crystallization.
Uses & applications
Popular for lapidary work, cabochon cutting, jewelry, tumbling, and decorative mineral collection.
Geological facts
Agate banding forms as successive layers of chalcedony precipitate out of silica-rich solutions over extended geological periods. Orbicular patterns create 'eye' shapes highly prized by collectors.
Field identification & locations
Look for distinct concentric banding or eye-like orbicular patterns beneath a rough or weathered rind. Common in volcanic regions worldwide, including Mexico, Brazil, Madagascar, and the Lake Superior region of North America.
