Montana Agate Facts, Information and Description The Montana agate is usually a creamy light yellow to almost clear color with embedded moss structures in varying shades of brownish red to black.
Montana Agate: The Montana agate is usually a creamy light yellow to almost clear color with embedded moss structures in varying shades of brownish red to black.
Montana Agate (-101) Known for its warm, deep browns and oranges, Montana agate is found around the Yellowstone River and its tributaries. Gravel deposits from the Pleistocene Age are the main source.
See also: Jewel, Agate, Stone, Birthstone, Rough
 
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