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Near the top of Thompson Peak, in Plumas County, California, can be found these epidote with albite specimens. Thompson Peak and the surrounding areas are products of volcanic flows 28-2 million years ago.
Epidote can form translucent crystals given the right amount of heat and pressure, but these are the product of hydrothermal alteration of various feldspars, micas, garnets and other minerals that composed igneous rocks.
Albite is a plagioclase feldspar that is also a result of hydrothermal activity, so it might not be a surprise that epidote and albite are found together.
In the photos, the specimens are sorted by weight from top-left to bottom-right. Choose your favorites!
