Banded Agate

Physical Properties

Hardness: 6.5-7 on Mohs scale; Color: Grey, black, and white translucent bands; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None; Specific gravity: 2.58-2.64.

Formation & Geological History

Formed in cavities within volcanic or metamorphic rocks where silica-rich groundwater deposited layers of chalcedony over thousands of years. Often associated with ancient lava flows.

Uses & Applications

Used extensively in jewelry, lapidary arts, ornamental carvings, and as a healing stone in metaphysical communities.

Geological Facts

Agate is named after the Achates River in Sicily. This specific specimen has been polished into a smooth palm stone or 'alien head' shape, highlighting the natural chalcedony banding.

Field Identification & Locations

Identified by its distinctive concentric or parallel banding and waxy appearance. Often found as nodules within volcanic host rocks or as pebbles in riverbeds.

Identified on: 4/29/2026

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