Normally these are only thumbnail sized! This monster is a doubly-terminated, heart-shaped twin Calcite from the Irving Materials Quarry of Indiana. The gemmy and lustrous, golden-amber crystal is complete all around. There are a few very minor bits of edge wear that I have not thought bothersome enough to treat with acid to make visibly disappear (but it could be done), but this twin is so significant that they carry little weight when it comes to the sheer quality of the crystal. Classic material from this well-known locale, in a size of significance...