mineral

Dendritic Agate

Silicon Dioxide with inclusions (SiO2 + Mn/Fe)

Hardness: 6.5-7 (Mohs scale); Color: Translucent gray or white with black/brown inclusions; Luster: Vitreous to waxy; Crystal Structure: Trigonal/Microcrystalline; Cleavage: None; Specific Gravity: 2.58-2.64.

Hardness: 6
Color: Translucent gray or white with black/brown inclusions
Luster: Vitreous to waxy

Identified May 28, 2026More mineral →

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Physical properties

Formation & geological history

Formed through the deposition of silica from groundwater in cavities of igneous rocks. The dendritic patterns are formed as manganese and iron oxides crystallize in a branching fashion between layers of chalcedony.

Uses & applications

Primarily used in jewelry (cabochons, beads, pendants) and as a collector's specimen. It is also common in lapidary arts and metaphysical practices.

Geological facts

Despite their plant-like appearance, the 'ferns' inside are actually inorganic mineral inclusions. Historically, it was known as the 'Stone of Plenitude' and associated with agricultural harvests.

Field identification & locations

Identify by its translucent body combined with dark, tree-like or moss-like organic patterns. It is frequently found in Brazil, India, Madagascar, and the USA (Montana). Field identification relies on hardness and the lack of distinct cleavage.

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