Where is Moss Agate found?
Chalcedony (silicon dioxide) with chlorite or hornblende inclusions
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Open the appMoss Agate occurs in specific geological environments. Knowing where to look, and in what kind of rock, is the difference between going home empty-handed and finding a great specimen.
Where to find Moss Agate
India
A primary source, particularly the Deccan Traps region, known for high-quality green moss agate.
United States
Montana (known for 'Montana Moss Agate' with red and black dendritic patterns), Oregon, Washington, and Wyoming.
Brazil
Various localities produce moss agate, often with diverse inclusion colors.
Uruguay
Known for agate deposits, including some moss agate varieties.
Australia
Found in several states, often associated with volcanic activity.
Russia
Ural Mountains region.
Collecting tips
- Look in Volcanic and Sedimentary Environments. Search in areas with past volcanic activity or in sedimentary beds where silica-rich solutions would have been present. Riverbeds and gravel deposits are also good places to find water-worn specimens.
- Identify Chalcedony. Moss Agate is a variety of chalcedony. Look for translucent, waxy-lustered material that is harder than steel (Mohs 6.5-7). The moss-like inclusions will be visible within the chalcedony.
- Examine for Dendritic Patterns. The key identifying feature is the presence of distinct, often green, black, or reddish, moss-like or fern-like inclusions within the translucent chalcedony matrix. Use a hand lens for better observation.
- Check for Conchodial Fracture. Like all chalcedony, Moss Agate will exhibit a conchoidal (shell-like) fracture when broken, rather than distinct cleavage planes.
Quick Check
- Color:
- Translucent white/gray with green/black/red moss-like patterns
- Luster:
- Waxy to vitreous
- Streak:
- White
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