sedimentary
Crazy Lace Agate
Silicon Dioxide (SiO2) with iron and aluminum inclusions
Hardness: 6.5-7 (Mohs scale); Color: Swirls of red, gray, cream, and brown; Luster: Waxy to vitreous; Crystal structure: Trigonal (Microcrystalline/Cryptocrystalline); Cleavage: None; Specific Gravity: 2.60-2.65
- Hardness
- 6
- Color
- Swirls of red, gray, cream, and brown
- Luster
- Waxy to vitreous
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Swirls of red, gray, cream, and brown; Luster: Waxy to vitreous; Crystal structure: Trigonal (Microcrystalline/Cryptocrystalline); Cleavage: None; Specific Gravity: 2.60-2.65
Formation & geological history
Formed in the Cretaceous period (about 65-90 million years ago) through volcanic activity. Silica-rich fluids filled cavities in volcanic rock, slowly depositing layers of microcrystalline quartz.
Uses & applications
Primarily used in jewelry, lapidary art, and as decorative metaphysical specimens (such as the polished tower pictured).
Geological facts
Known as the 'Laughter Stone' or 'Mexican Lace Agate,' it is found almost exclusively in Chihuahua, Northern Mexico. Its complex patterns are caused by the presence of iron and manganese.
Field identification & locations
Identify by its intricate, wavy, lace-like patterns and 'eyes'. It is commonly found in areas of concentrated volcanic ash deposits. For collectors, look for high color contrast and well-defined 'lace' layers.
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