mineral

Dendritic Agate (specifically Orange/Tumbled)

Silicon Dioxide (SiO2) with Oxide Inclusions

Hardness: 6.5–7 on the Mohs scale; Color: Translucent orange or yellowish with black/dark green tree-like inclusions; Luster: Vitreous to waxy; Structure: Hexagonal (trigonal); Specific Gravity: 2.58–2.64.

Hardness: 6
Luster: Vitreous to waxy

Identified March 14, 2026More mineral →

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Physical properties

Formation & geological history

Formed as silica-rich groundwater seeps into fissures in volcanic or sedimentary rock, slowly solidifying into chalcedony. The dark 'fern' patterns are manganese or iron oxide branching (dendrites) trapped during formation, typically occurring over millions of years.

Uses & applications

Primarily used in jewelry (cabochons and beads), ornamental carvings, and as a popular specimen for metaphysical collectors and lapidary hobbyists.

Geological facts

Known as the 'Stone of Plenitude' in folklore, it was historically associated with Greek dryads and buried in fields to ensure a good harvest. Despite its name, dendritic agate is often technically a chalcedony rather than a true banded agate.

Field identification & locations

Identify in the field by its waxy luster and unique tree-like branching patterns that are not actual fossils but mineral growths. Common locations include Brazil, India, Madagascar, and the USA (specifically Montana).

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