Agate Geode

Physical Properties

Hardness: 6.5-7 on Mohs scale; Color: White, translucent, and iron-stained orange/brown; Luster: Waxy to vitreous; Crystal structure: Trigonal (microcrystalline); Cleavage: None; Specific Gravity: 2.58–2.64.

Formation & Geological History

Formed in cavities within volcanic or sedimentary rocks. Silica-rich groundwater percolates through these voids, depositing layers of chalcedony over thousands of years to create the banded agate and inner crystalline druse.

Uses & Applications

Used primarily for lapidary work, jewelry, interior decoration, and as a collector's specimen due to its aesthetic banding and hollow center.

Geological Facts

Agates are some of the oldest healing stones in history. This specific specimen features a 'druzy' center where tiny quartz crystals have formed within the hollow cavity.

Field Identification & Locations

Identify in the field by looking for rounded nodules with a rough, weathered exterior but a translucent, banded interior when broken. Commonly found in riverbeds or volcanic ash deposits in regions like Brazil, Mexico, or the Western USA.

Identified on: 4/13/2026

Mode: Standard