mineral

Botryoidal Agate

Chalcedony (Silicon Dioxide, SiO2)

Hardness: 6.5–7 (Mohs scale); Color: Cream, tan, and light brown with band pattern; Luster: Waxy to vitreous; Structure: Microcrystalline (Trigonal); Habit: Botryoidal (grape-like clusters); Specific Gravity: 2.6-2.65.

Hardness: 6
Color: Cream, tan, and light brown with band pattern
Luster: Waxy to vitreous

Identified March 13, 2026More mineral →

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Physical properties

Formation & geological history

Formed via the deposition of silica from groundwater in cavities of igneous or sedimentary rocks. This specific botryoidal formation suggests growth in an open pocket or vug. Geological age varies by locality, often Tertiary or older.

Uses & applications

Commonly used in lapidary work for cabochons, jewelry, and as decorative display specimens. Also valued in holistic 'crystal healing' communities and by mineral collectors for its unique habit.

Geological facts

The term 'botryoidal' comes from the Greek word 'botrys', meaning a bunch of grapes. Agates are unique because every single specimen features a distinct pattern and color arrangement that can never be perfectly replicated.

Field identification & locations

Identify in the field by its waxy luster, 'bubbly' surface texture, and concentric banding. Commonly found in volcanic regions of Oregon, Washington, and many parts of South America and Mexico. It will not be scratched by a steel knife.

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