mineral

Agate (Sliced and Carved)

Silicon Dioxide (SiO2) - Banded Chalcedony

AI-generated identification · may be incorrect

Hardness: 6.5-7 on Mohs scale; Color: Semi-translucent light grey, white, cream with orbicular or eyes/tubes pattern; Luster: Waxy to vitreous; Crystal Structure: Trigonal (microcrystalline/cryptocrystalline quartz); Cleavage: None, conchoidal fracture.

Hardness: 6
Luster: Waxy to vitreous

Identified July 24, 2026More mineral →

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Physical properties

Formation & geological history

Formed primarily in cavities within volcanic host rocks as silica-rich fluid precipitates layer by layer over millions of years. This piece has been cut, carved, and polished into a decorative slab shape.

Uses & applications

Used primarily for lapidary art, decorative displays, jewelry, coasters, and mineral collections.

Geological facts

Agate is a variety of chalcedony characterized by fine grain and brightness of color. Small tube or 'eye' formations seen here occur when mineral-rich solutions deposit around needle-like inclusions or bubbles inside the cavity.

Field identification & locations

Identified by its microcrystalline translucency, waxy luster, hardness (will scratch glass), and fine concentric or orbicular banding. Commonly found in Brazil, Uruguay, USA (Oregon, Lake Superior region), and Madagascar.