Purple Cow Agate

Purple Cow Agate and Jasper is a mixture of primarily red and yellow jasper with purple agate. The striking color differences make beautiful cabs. It is found in the McDermitt Caldera on the border of Nevada and Oregon. A caldera is a large, highly explosive volcano that erupted so violently that it blew off the top of the mountain. Yellowstone is a modern caldera and the hot springs and geysers are a result of heat from the magma below the surface. The hydrothermal fluids from the magma that were injected into the rhyolite ash of the volcano have produced a number of different types of agates and jaspers within the caldera. Opal is often associated with the agates as well.

Purple Cow Agate and Purple Cloud Agate are found in close proximity to each other.

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