Petoskey Stone - PS14.6
Cut & Polished Petoskey Stone, Lake Michigan
6.75" 1.5" x 2.5" / 14.6 oz
This interesting stone is a variety of calcite. It was formed, some 375 million years ago, by the fossilization of ancient coral, Hexagonaria. The coral lived in shallow waters and today's fossil often includes ancient silt and mud. Petoskey Stones are found on many beaches of Lake Michigan and Lake Huron, as well as in rock quarries from Traverse City to Alpena. The honeycomb patterned stone has a hardness from 4 to 5 and, since 1965, is the official Michigan State Stone.
I collected, cut & polished this stone myself. I cut the stone in half and then polished and buffed the face. I've uploaded 2 images: 1) front (with cut & polished face); 2) back (natural / unpolished)