mineral

Crazy Lace Agate

Silicon Dioxide (SiO2) - Chalcedony variety

Hardness: 6.5-7 (Mohs scale); Color: White, cream, tan, grey with red and brown swirls; Luster: Vitreous to waxy; Crystal structure: Hexagonal (microcrystalline); Cleavage: None; Specific gravity: 2.6-2.65

Hardness: 6
Color: White, cream, tan, grey with red and brown swirls
Luster: Vitreous to waxy

Identified April 4, 2026More mineral →

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Physical properties

Formation & geological history

Formed in the Cretaceous period (about 65-90 million years ago) within crevices of limestone and volcanic rock through the deposition of silica-rich groundwater.

Uses & applications

Primarily used in jewelry (cabochons, beads), decorative carvings, meditation stones, and as a popular specimen for collectors.

Geological facts

Known as the "Laughter Stone" or "Mexican Agate," it is exclusively found in Chihuahua, Mexico. Its intricate patterns are caused by layers of iron and aluminum oxides.

Field identification & locations

Identify by its unique 'lace-like' patterns and complex zig-zag bands. It is most commonly found in northern Mexico. Collectors should look for vibrant red contrast and well-defined band patterns.

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Mineral/Rock

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