mineral
Moss Agate (Crescent Moon Shape)
Silicon Dioxide (SiO2) with iron/manganese inclusions
Hardness: 6.5-7 on Mohs scale; Color: Brown, green, white, and translucent; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None (conchoidal fracture).
- Hardness
- 6
- Color
- Brown, green, white, and translucent
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 on Mohs scale; Color: Brown, green, white, and translucent; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None (conchoidal fracture).
Formation & geological history
Formed through volcanic activity where silica-rich groundwater deposited chalcedony along with iron or manganese oxides into rock cavities and vugs over millions of years.
Uses & applications
Popular for decorative carvings, lapidary art, crystal healing, and jewelry manufacturing.
Geological facts
Despite its name, moss agate does not contain organic plant material; its moss-like or tree-like patterns are formed by mineral impurities such as iron, chlorite, or manganese oxides.
Field identification & locations
Identified by its translucent chalcedony matrix filled with dendritic or web-like mineral inclusions and small quartz-lined cavities (druzy pockets). Commonly sourced from India, Brazil, and the USA.
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