Mineral

Tree Agate (or Moss Agate), faceted into a crystal tower

Dendritic Agate (Silicon Dioxide, SiO2)

Hardness: 6.5-7 (Mohs scale), Color: White or clear base with green branching inclusions, Luster: Vitreous to waxy, Crystal Structure: Hexagonal (trigonal) microcrystalline, Specific Gravity: 2.58–2.64

Hardness: 6

Identified March 18, 2026More mineral →

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Physical properties

Formation & geological history

Formed in volcanic host rocks through the cooling of silica-rich groundwater. The green 'moss' patterns are caused by dendritic inclusions of manganese or iron oxides (chlorite and hornblende) that crystallize as the silica hardens over millions of years.

Uses & applications

Primarily used in jewelry, ornamental carvings, and 'holistic' or meditation practices as a 'tower' or 'point'. Also popular for metaphysical specimen collecting.

Geological facts

Despite its name, Moss and Tree agates are not technically agates because they lack the 'banding' required to be an agate; they are more accurately a variety of chalcedony. The green patterns are inorganic minerals, not actual fossilized plant matter.

Field identification & locations

Identification in the field is based on its translucent to opaque white chalcedony body and dark green dendritic (branch-like) patterns. Commonly sourced from India, Brazil, and the USA (USA/Montana). In this form, it is specifically shaped (lapped) into a hexagonal obelisk.

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