Realgar in Calcite

A very large crystal of calcite with small little veins of realgar growing throughout. I can't tell from the sample if the realgar is simply massive or crystalline, however it is still a nice little inclusion sample. Realgar is another crystal that will slowly degrade in light, but I am not sure how well the calcite slows this reaction. Regardless, I am still protecting it mostly from the light. This crystal measures about 4 inches long.