mineral

Polished Mexican “Crazy Lace” agate tower

Microcrystalline quartz (chalcedony), SiO₂, with iron-oxide inclusions

AI-generated identification · may be incorrect

Hardness 6.5–7 Mohs; opaque cream, orange, red, and brown banding with a waxy-to-glassy luster. It has cryptocrystalline quartz structure, no visible cleavage, and typically weighs about 2.5–2.7 specific gravity; the pictured piece is cut and polished.

Identified August 8, 2026More mineral →

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Physical properties

Formation & geological history

Formed when silica-rich groundwater filled cavities in volcanic rocks, depositing successive layers of chalcedony and iron-stained material. Most commercial material comes from Cretaceous volcanic terrains of Chihuahua, Mexico.

Uses & applications

Used for cabochons, carvings, beads, bookends, and decorative towers; it is popular as an affordable ornamental gemstone and collector material.

Geological facts

The intricate lace-like patterns are produced by rhythmic chalcedony growth and mineral impurities, not fossils. “Crazy Lace” is a trade name rather than a formal mineral species.

Field identification & locations

Identify it by its concentric or swirling lace patterns, fine-grained quartz texture, and inability to scratch with a steel knife; glass can be scratched by quartz. Common sources include Chihuahua, Mexico, and similar agates worldwide.