Rock Identifier
Moss Agate (Silicon Dioxide (SiO2) with mineral inclusions of hornblende or chlorite) — Mineral (variety of Chalcedony)
Mineral (variety of Chalcedony)

Moss Agate

Silicon Dioxide (SiO2) with mineral inclusions of hornblende or chlorite

Hardness: 6.5-7 (Mohs scale); Color: Translucent to white with green, moss-like inclusions; Luster: Vitreous to waxy; Crystal Structure: Trigonal (Microcrystalline); Cleavage: None; Specific Gravity: 2.58–2.64.

Hardness
6
Color
Translucent to white with green, moss-like inclusions
Luster
Vitreous to waxy
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Physical properties

Hardness: 6.5-7 (Mohs scale); Color: Translucent to white with green, moss-like inclusions; Luster: Vitreous to waxy; Crystal Structure: Trigonal (Microcrystalline); Cleavage: None; Specific Gravity: 2.58–2.64.

Formation & geological history

Formed through the cooling of silica-rich volcanic fluids. The characteristic 'moss' patterns are Created by dendritic inclusions of manganese or iron oxides, and green chlorite or hornblende materials that enter fissures in the stone as it forms.

Uses & applications

Primarily used in jewelry making (cabochons, beads), decorative carvings, and as a popular specimen for crystal collectors and metaphysical practices.

Geological facts

Despite its name, Moss Agate does not contain organic matter; the patterns are purely mineral. It has been used for centuries and was historically known as a 'gardener's stone' believed to help crops grow.

Field identification & locations

Identify in the field by its semi-translucent body and distinct branching/filamentous green inclusions. Common locations include India, Brazil, Uruguay, and the United States (specifically Montana). It is often found in basaltic rocks or as river pebbles.

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