mineral

Dendritic Agate

Silicon Dioxide (SiO2) with Manganese/Iron oxide inclusions

Hardness: 6.5-7 on Mohs scale; Color: Translucent white or gray with dark, tree-like inclusions; Luster: Vitreous to waxy; Crystal Structure: Trigonal (microcrystalline); Cleavage: None

Hardness: 6
Color: Translucent white or gray with dark, tree-like inclusions
Luster: Vitreous to waxy

Identified May 6, 2026More mineral →

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Physical properties

Hardness: 6.5-7 on Mohs scale; Color: Translucent white or gray with dark, tree-like inclusions; Luster: Vitreous to waxy; Crystal Structure: Trigonal (microcrystalline); Cleavage: None

Formation & geological history

Formed through the deposition of silica from groundwater in cavities of igneous rocks. The dendritic patterns are created when manganese or iron oxides seep into cracks and crystallize in branching patterns during the cooling or hardening process.

Uses & applications

Primarily used in jewelry (cabochons, beads), decorative carvings, and as a popular collector's specimen for its unique 'landscape' patterns.

Geological facts

Also known as the 'Stone of Plentitude' in folklore. Although called an agate, it is technically a chalcedony because it lacks the classic banded patterns of most true agates.

Field identification & locations

Identify by looking for fern-like or tree-like dark inclusions inside a translucent white or gray base. Commonly found in Brazil, India, Madagascar, and parts of the United States like Montana.

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