mineral

Banded Agate

Silicon Dioxide (SiO2)

Hardness: 6.5-7 Mohs; Color: White, grey, and brownish-grey bands; Luster: Waxy to vitreous; Crystal Structure: Trigonal (cryptocrystalline); Cleavage: None; Specific Gravity: 2.58-2.64

Hardness: 6
Color: White, grey, and brownish-grey bands
Luster: Waxy to vitreous

Identified July 21, 2026More mineral →

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Physical properties

Hardness: 6.5-7 Mohs; Color: White, grey, and brownish-grey bands; Luster: Waxy to vitreous; Crystal Structure: Trigonal (cryptocrystalline); Cleavage: None; Specific Gravity: 2.58-2.64

Formation & geological history

Formed through the deposition of silica from groundwater in the cavities of igneous or sedimentary rocks, often resulting from volcanic activity. These layers form over thousands of years.

Uses & applications

Used primarily in jewelry (cabochons, beads), decorative carvings, and as a collector's specimen. Historically used for making mortars and pestles due to its hardness.

Geological facts

The name Agate comes from the Achates River in Sicily. Each agate is unique, and the banding patterns are like a geological fingerprint representing different stages of mineral deposition.

Field identification & locations

Identify by its characteristic concentric or parallel banding and waxy texture. Commonly found in Brazil, India, and the Lake Superior region of the US. Collectors look for sharp, distinct banding and translucency.