mineral

Agate (Brecciated / Moss Agate with Jasproid Inclusions)

Silicon Dioxide (SiO2)

Hardness: 6.5-7 on the Mohs scale. Color: Banded white, brown, red, orange, and gray hues. Luster: Waxy to vitreous. Crystal system: Microcrystalline/trigonal (chalcedony variety). Cleavage: None (conchoidal fracture). Specific gravity: 2.58-2.64.

Hardness: 6
Color: Banded white, brown, red, orange, and gray hues
Luster: Waxy to vitreous

Identified July 24, 2026More mineral →

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Physical properties

Formation & geological history

Formed through precipitation of silica from groundwater inside cavities (vesicles) within volcanic host rocks or fractured host rocks, creating characteristic concentric and brecciated banding patterns.

Uses & applications

Widely used for lapidary arts, cabochon cutting, jewelry, decorative polished slabs, and mineral collections.

Geological facts

Agate is a banded form of chalcedony. The rich red and reddish-brown inclusions are due to iron oxides (hematite/goethite) mixed with silica during crystallization.

Field identification & locations

Identified by its distinctive microcrystalline translucency, multi-colored banding, and fracture patterns. Commonly found in Brazil, Uruguay, Madagascar, the United States, and Mexico. Collectors value distinct patterns and contrast.

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