mineral

Dendritic Agate

Silicon Dioxide (SiO2) with Manganese/Iron Oxide inclusions

Hardness: 6.5-7 (Mohs). Color: Translucent white or gray with black/brown branch-like inclusions. Luster: Vitreous to waxy. Crystal Structure: Hexagonal (Microcrystalline). Cleavage: None. Specific Gravity: 2.6-2.65.

Hardness: 6
Luster: Vitreous to waxy

Identified May 31, 2026More mineral →

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Physical properties

Formation & geological history

Formed through the percolation of manganese or iron-rich mineralized water into cracks or cavities in host rocks, where the minerals crystallize into fern-like patterns over thousands of years within volcanic or sedimentary environments.

Uses & applications

Primarily used as a semi-precious gemstone in jewelry (cabochons, pendants), ornamental carvings, and for metaphysical collecting.

Geological facts

The name 'Dendritic' comes from the Greek word 'dendron' meaning tree. Though they look like fossils of plants, these are strictly mineral growth patterns (pseudofossils).

Field identification & locations

Identify by looking for plant-like, branching patterns (dendrites) inside a translucent chalcedony base. Often found in Brazil, India, and the USA (Montana/Oregon). Collectors should look for high contrast and intact 'pictures' within the stone.

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