mineral

Agate in Matrix

Silicon Dioxide (SiO2) within host rock

AI-generated identification · may be incorrect

Hardness: 7 on the Mohs scale. Color: White, blueish-grey, and reddish-brown matrix. Luster: Vitreous to waxy. Crystal structure: Trigonal (microcrystalline quartz/chalcedony). Cleavage: None, exhibits conchoidal fracture. Specific gravity: 2.60-2.65.

Hardness: 7 on the Mohs scale
Color: White, blueish-grey, and reddish-brown matrix
Luster: Vitreous to waxy

Identified August 4, 2026More mineral →

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Physical properties

Formation & geological history

Formed by the deposition of silica from groundwater solutions in the cavities of igneous or sedimentary rocks, often originating in volcanic gas bubbles or fissures over millions of years.

Uses & applications

Used in ornamental objects, jewelry, specimen collecting, and lapidary arts.

Geological facts

Agate is a diverse variety of chalcedony. The colorful banding or filling inside the rock represents successive layers of silica deposition inside a hollow cavity.

Field identification & locations

Easily identified by its hardness (scratches glass), waxy luster, and smooth conchoidal fracture of the exposed silica center. Commonly found in regions with past volcanic activity.