mineral
Moss Agate
Silicon Dioxide (SiO2) with inclusions
Hardness: 6.5-7.0 (Mohs). Color: Translucent gray/white with dark green or black moss-like inclusions. Luster: Vitreous to waxy. Crystal system: Trigonal/Microcrystalline. Specific gravity: 2.58-2.64.
- Hardness
- 6
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7.0 (Mohs). Color: Translucent gray/white with dark green or black moss-like inclusions. Luster: Vitreous to waxy. Crystal system: Trigonal/Microcrystalline. Specific gravity: 2.58-2.64.
Formation & geological history
Formed as a result of weather volcanic rocks. It develops in volcanic cavities when mineral-rich water seeps through and deposits silica along with iron or manganese oxides which form the dendritic inclusions.
Uses & applications
Primarily used in jewelry (cabochons, beads), decorative carvings, and as a popular collector's specimen. Historically used in talismans.
Geological facts
Despite the name, moss agate does not contain organic matter; the 'moss' is actually dendritic inclusions of manganese or iron oxides. It is often associated with the 'gardener's stone' folklore.
Field identification & locations
Identify by its characteristic branching tree-like or moss-like green patterns suspended in translucent chalcedony. It can be found globally with significant deposits in India, Brazil, and the USA (Montana/Oregon).
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