mineral

Agate (specifically Lace Agate or Banded Agate)

Silicon Dioxide (SiO2)

Hardness: 6.5-7 (Mohs scale); Color: Multicolored bands including brown, white, gray, and red; Luster: Waxy to vitreous; Crystal structure: Hexagonal/trigonal (cryptocrystalline); Cleavage: None (conchoidal fracture); Specific gravity: 2.58–2.64.

Hardness: 6
Color: Multicolored bands including brown, white, gray, and red
Luster: Waxy to vitreous

Identified January 15, 2026More mineral →

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Physical properties

Formation & geological history

Formed as secondary deposits in volcanic cavities (amygdales) or sedimentary rocks. Silica-rich fluids precipitate in layers over long periods, often associated with ancient volcanic activity ranging from millions to billions of years old.

Uses & applications

Primarily used in jewelry for cabochons and beads, as well as ornamental carvings, paperweights, and collection specimens. Historically used for making precision bearings and pestles.

Geological facts

Agate is named after the Achates River in Sicily where it was first discovered. The 'lace' or 'eye' patterns seen here are caused by rhythmic crystallization of quartz and moganite in confined spaces.

Field identification & locations

Identify in the field by its distinct colorful banding, waxy texture when broken, and lack of cleavage (concave, shell-like fractures). Commonly found in areas with eroded volcanic basalt, such as the Lake Superior region, Mexico (Laguna/Crazy Lace), and Brazil. Collectors should look for 'nodules' that feel heavier than typical rocks.

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