mineral

Banded Agate

Agate (chalcedony variety of Silicon Dioxide, SiO2)

Hardness: 6.5-7 on Mohs scale; Color: Tans, yellows, and whites with characteristic banding; Luster: Waxy to vitreous; Crystal Structure: Trigonal (microcrystalline/cryptocrystalline); Cleavage: None; Specific Gravity: 2.58-2.64.

Hardness: 6
Color: Tans, yellows, and whites with characteristic banding
Luster: Waxy to vitreous

Identified July 15, 2026More mineral →

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Physical properties

Formation & geological history

Formed in voids or cavities of volcanic rocks (lava) or certain sedimentary rocks. These cavities are filled by silica-rich groundwater that deposits layers of chalcedony over thousands of years, creating the banding.

Uses & applications

Used primarily in lapidary arts for jewelry, beads, bookends, and ornaments. Historically used for making mortars and pestles because of its hardness.

Geological facts

Agate was one of the first materials used for tool making by early humans. Many varieties are named specifically for their location, like Lake Superior Agate or Botswana Agate.

Field identification & locations

Identify in the field by its waxy appearance, conchoidal fracture (breaks like glass), and distinct color banding or translucency when held to the light. Found worldwide in riverbeds and ancient volcanic sites.

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