mineral

Dendritic Agate

Silicon Dioxide with Manganese or Iron Oxide inclusions (SiO2 + Mn/Fe)

Hardness: 6.5–7 (Mohs scale); Color: Translucent white to milky grey with dark, branch-like inclusions; Luster: Vitreous to waxy; Crystal structure: Hexagonal (cryptocrystalline); Cleavage: None (conchoidal fracture); Specific gravity: 2.58–2.64.

Hardness: 6
Luster: Vitreous to waxy

Identified March 28, 2026More mineral →

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Physical properties

Formation & geological history

Formed in volcanic and metamorphic environments when silica-rich groundwater flows through rock cavities. The 'dendrites' are formed as manganese and iron oxides crystallize into tree-like patterns between layers of chalcedony. Geological age varies greatly by deposit, ranging from several million to hundreds of millions of years old.

Uses & applications

Primarily used in the lapidary arts for jewelry (cabs, beads, pendants), as decorative ornaments, and as high-value collectibles for mineral enthusiasts.

Geological facts

Commonly referred to as the 'Stone of Plenitude' in metaphysical circles. Despite the name, it is technically an agate-like chalcedony rather than a true banded agate. The name 'dendrite' comes from the Greek word 'dendron,' meaning tree.

Field identification & locations

Identify in the field by its characteristic mossy or fern-like black/brown inclusions within a translucent quartz-like base. It is common in India, Brazil, the US (Montana/Wyoming), and Kazakhstan. Collectors look for high translucency and clear, artistic 'scenes' created by the inclusions.

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