mineral

Agate Geode Node

Cryptocrystalline Quartz (SiO2)

Hardness: 6.5-7 on Mohs scale; Color: Gray, white, and translucent with dark inclusions; Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal; Cleavage: None/Conchoidal fracture; Specific Gravity: 2.60-2.65.

Hardness: 6
Color: Gray, white, and translucent with dark inclusions
Luster: Vitreous to waxy

Identified June 13, 2026More mineral →

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Physical properties

Formation & geological history

Formed in cavities (vesicles) of volcanic rocks or sedimentary limestone. Silica-rich groundwater percolates through these cavities, depositing layers of microcrystalline quartz over thousands of years. Usually found in formations dating from the Cenozoic to Precambrian eras.

Uses & applications

Commonly used for lapidary work, jewelry (cabochons), interior decor, and as educational or healing stone specimens for collectors.

Geological facts

Agate is named after the Achates River in Sicily. This specific specimen shows a small internal vug or cavity, making it a mini-geode or 'ocho' agate.

Field identification & locations

Identify by its translucent waxy appearance and internal banding or cavity. Commonly found in riverbeds, volcanic ash deposits, and desert regions globally (notably Brazil, Mexico, and Lake Superior). Collectors look for banding and crystal growth inside.