mineral

Agate (specifically crazy lace agate / orbicular agate node)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

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.

Hardness: 6
Luster: Waxy to vitreous

Identified July 22, 2026More mineral →

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Physical properties

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.

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