mineral

Botryoidal Agate

Silicon Dioxide (SiO2)

Hardness: 6.5-7 (Mohs chart). Color: Translucent white, tan, and brown with banded patterns. Luster: Waxy to vitreous. Crystal structure: Trigonal (microcrystalline/cryptocrystalline). Habitus: Botryoidal (grape-like clusters) and banded.

Hardness: 6
Color: Translucent white, tan, and brown with banded patterns
Luster: Waxy to vitreous

Identified June 7, 2026More mineral →

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Physical properties

Formation & geological history

Formed through the deposition of silica-rich groundwaters in volcanic rock cavities or sedimentary geodes. Common in basaltic lava flows and hydrothermal veins across various geological eras.

Uses & applications

Used primarily in lapidary arts, jewelry (cabochons), interior decor, and as popular specimens for geological collectors.

Geological facts

Agate is a variety of chalcedony. The 'botryoidal' texture seen here comes from the Greek word 'botrys', meaning a bunch of grapes; it occurs when crystals grow around many nuclei simultaneously.

Field identification & locations

Identify in the field by the distinct rounded, bubble-like surface and concentric banding. Commonly found in lake shores, volcanic regions, and desert washes. This specimen shows a mix of stalactitic growth and botryoidal clusters.