The Fanned Crystal Structure is due to compressed growth between sheets of anthracite coal
shale. At one time these were mistakenly thought to be fossilized sand dollars or lily pads. These are
located by gently splitting the layers of shale and then must be cleaned by a labor intensive process which
produces such wonderful treasures! Pyrite. You can see mine is losing its luster and over time it will disintegrate. Some say you can stabilize by sealing the pyrite but in my experience it won't work.