mineral

Polished banded agate cabochons

Agate, a microcrystalline variety of quartz (SiO₂), likely Mexican Crazy Lace agate

AI-generated identification · may be incorrect

Hardness 6.5–7 Mohs; opaque to translucent, with glossy polish and intricate cream, pink, gray, and brown bands. Quartz is trigonal; agate lacks visible cleavage and has conchoidal fracture. Specific gravity is about 2.6.

Identified October 17, 2026More mineral →

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Physical properties

Formation & geological history

Silica-rich fluids deposited successive layers in cavities, commonly in volcanic rocks; the precise age and locality cannot be established from the image. The pieces are cut and polished natural material.

Uses & applications

Used for jewelry cabochons, beads, carvings, and collections; agate is also used for ornamental objects and, historically, precision instruments.

Geological facts

Agate banding records changing conditions as silica accumulated in layers; the term “Crazy Lace” describes especially elaborate, swirling patterns.

Field identification & locations

Identify by fine, curved or irregular bands and quartz-like hardness; Mexican material is a common source. Similar patterned agates occur worldwide, and locality confirmation generally requires provenance.