mineral

Moss Agate with Quartz Druzy

Chalcedony with inclusions (SiO2)

Hardness: 6.5-7 Mohs; Color: White, translucent, and dark green dendritic inclusions; Luster: Vitreous to waxy; Crystal Structure: Trigonal (microcrystalline); Cleavage: None; Specific Gravity: 2.58-2.64

Hardness: 6
Color: White, translucent, and dark green dendritic inclusions
Luster: Vitreous to waxy

Identified June 24, 2026More mineral →

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Physical properties

Formation & geological history

Formed from the deposition of silica-rich groundwater in cavities of igneous rocks like basalt. The green moss-like patterns are caused by inclusions of manganese or iron oxides, often orogeny related, dating back millions of years.

Uses & applications

Primarily used in jewelry (cabochons, beads), decorative carvings, and as a popular collector's specimen due to its unique patterns and therapeutic 'crystals' associations.

Geological facts

Despite its name, Moss Agate does not contain organic plant matter; the 'moss' is actually mineral dendrites. It has been known as the 'Gardener's Stone' and was historically used as an amulet for agricultural prosperity.

Field identification & locations

Identify by looking for translucent chalcedony hosting green dendritic inclusions that resemble moss or plants, often accompanied by white crystalline quartz (druzy). Common locations include India, Brazil, and the USA (Montana/Wyoming).

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