Montana Agate Pendant~JSSMAG10 Mexico Large crystals in igneous rocks

Large crystals in igneous rocks are usually attributed to a slow rate of crystallization

30mm x 4mm

93mm x 80mm x 43mm

provides for practicality with respect to ones avocation

Montana Agate Pendant~JSSMAG10 Mexico Large crystals in igneous rocksSterling Silver Montana Agate Pendant~JSSMAG10. Montana Agates formed as a result of volcanic eruptions and massive lava flow about 60 million years ago in the Yellowstone Park area. These are no ordinary agates; they are a one of a kind rock, that are located only along the banks and beds of the Yellowstone River and its tributaries (The filming locations for the movie A River runs Through it). The Yellowstone River is the most prominent river