Rock Identifier
Banded Agate (SiO2 (Silicon Dioxide)) — mineral
mineral

Banded Agate

SiO2 (Silicon Dioxide)

Hardness: 6.5-7 (Mohs scale), Color: Gray, white, black, purple bands, Luster: Vitreous, Crystal structure: Cryptocrystalline, Cleavage: None, Specific gravity: 2.58-2.64

Hardness
6
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Physical properties

Hardness: 6.5-7 (Mohs scale), Color: Gray, white, black, purple bands, Luster: Vitreous, Crystal structure: Cryptocrystalline, Cleavage: None, Specific gravity: 2.58-2.64

Formation & geological history

Formed in cavities of volcanic rocks by the deposition of silica from aqueous solutions. Age varies depending on the host rock.

Uses & applications

Used in jewelry, lapidary, and ornamental objects.

Geological facts

Agate was highly valued as a talisman or amulet in ancient times.

Field identification & locations

Identified by its characteristic banding and translucency. Common locations include Brazil, Uruguay, and various parts of the USA.

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