This necklace is strung with 32" of semi-precious, earth tone stones. I wire wrapped the 2 1/4" heart shaped stone from Moroccothat has the same properties of a Petoskey stone.
A Petoskey Stone is a fossil of a colonial coral (Hexagonaria percarinata) that lived in a shallow sea during Devonian time about 350 million years ago. When the corals died they were covered with sediment and became part of a rock unit known as the Alpena Limestone. The Alpena Limestone outcrops along the coast of Little Traverse Bay near the city of Petoskey, Michigan - which is the town for which the stones have been named. The calcium carbonate exoskeleton of the coral colony is what became a Petoskey Stone. The fossil corals range in size from small specimens of a few animals that are an inch or two across to large colonies that can be several feet across and weigh over 1000 pounds. A photo of a modern colonial coral is shown in the photo at right. During the Great Ice Age, glaciers scoured northern Michigan, breaking up the Alpena Limestone and scattering the fossil corals in glacial till across the landscape of the Great Lakes Region. Streams and waves then reworked the till, shaping the fossil corals into smooth round "stones".