sedimentary
Green Moss Agate (Tumbled)
Silicon Dioxide (SiO2) with mineral inclusions
Hardness: 6.5-7 (Mohs scale), Color: Translucent to opaque green with moss-like inclusions, Luster: Vitreous to waxy, Crystal Structure: Hexagonal (cryptocrystalline), Specific Gravity: 2.58-2.64
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 (Mohs scale), Color: Translucent to opaque green with moss-like inclusions, Luster: Vitreous to waxy, Crystal Structure: Hexagonal (cryptocrystalline), Specific Gravity: 2.58-2.64
Formation & geological history
Formed from silica-rich groundwater filling cavities in volcanic rocks. The green 'moss' patterns are caused by inclusions of minerals such as manganese or iron oxide. They are found in basaltic rocks dating back millions of years.
Uses & applications
Primarily used for jewelry (cabochons, beads), decorative tumbled stones, and as a collector's mineral. Occasionally used in artisanal crafts and as a pocket stone.
Geological facts
Despite its name, Moss Agate is not actually an agate in the strictest sense as it lacks the concentric banding of true agate. It is sometimes called the 'Mocha Stone' after the city of Mocha in Yemen.
Field identification & locations
Identify by its characteristic green dendritic (vegetation-like) inclusions and its waxy luster when polished. It is commonly found in India, Brazil, the USA, and Uruguay. Field identification involves looking for translucent chalcedony containing green filaments.
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