mineral
Moss Agate
Silicon Dioxide (SiO2) with inclusions
AI-generated identification · may be incorrectHardness: 6.5-7 on Mohs scale; Color: Cream, yellowish-white matrix with dark green to mossy green inclusions; Luster: Vitreous to waxy; Crystal Structure: Trigonal (microcrystalline/cryptocrystalline chalcedony); Cleavage: None; Conchoidal fracture.
- Hardness
- 6
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 on Mohs scale; Color: Cream, yellowish-white matrix with dark green to mossy green inclusions; Luster: Vitreous to waxy; Crystal Structure: Trigonal (microcrystalline/cryptocrystalline chalcedony); Cleavage: None; Conchoidal fracture.
Formation & geological history
Forms primarily in hydrothermal and volcanic environments as silica-rich fluids fill cavities and fractures within volcanic rocks. The green dendritic or moss-like inclusions are typically minerals like chlorite, hornblende, or manganese oxides.
Uses & applications
Used extensively as an ornamental stone, in lapidary arts for cabochons, beads, carved figurines, tumbled pocket stones, and decorative jewelry.
Geological facts
Despite its name, Moss Agate is not actually a true agate because it lacks concentric banding; it is technically a chalcedony containing dark dendritic mineral inclusions that mimic moss or plant growth.
Field identification & locations
Identified by its smooth, polished waxy surface with distinctive dark green vegetation-like patterns embedded within a translucent to opaque creamy matrix. Commonly found in India, Brazil, Uruguay, and the USA.
