sedimentary
Green Moss Agate
Silicon Dioxide with inclusions (SiO2)
Hardness: 6.5-7 (Mohs scale); Color: Translucent to opaque white/clear with green dendritic inclusions; Luster: Vitreous to waxy; Crystal Structure: Hexagonal (cryptocrystalline); Cleavage: None (conchoidal fracture).
- Hardness
- 6
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Translucent to opaque white/clear with green dendritic inclusions; Luster: Vitreous to waxy; Crystal Structure: Hexagonal (cryptocrystalline); Cleavage: None (conchoidal fracture).
Formation & geological history
Formed through the deposition of silica from groundwater in the cavities of igneous rocks. The green 'moss' is actually dendritic inclusions of manganese or iron oxide that formed during the cooling process.
Uses & applications
Primarily used for ornamental jewelry (cabochons, beads), decorative carvings, and as a popular specimen for crystal collectors and lapidary hobbyists.
Geological facts
Despite its name, Moss Agate is not an organic material and contains no actual moss. It was historically known as the 'Gardener's Stone' and was believed to ensure a bountiful harvest in various ancient cultures.
Field identification & locations
Identify in the field by its characteristic moss-like green patterns against a milky or clear chalcedony base. Commonly found in India, Brazil, Uruguay, and the western United States (especially Montana). Specimens often appear as rough, waxy nodules until sliced open.
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