Petoskey Stone (polished)-A maligano jasper and fluorescence make calcite a

and fluorescence make calcite a desirable mineral to collect

purify the air

Serpentine has been used as an architectural stone for thousands of years

It's Mohs hardness is 7

about 350 million years ago

Petoskey Stone (polished)-A maligano jasper and fluorescence make calcite aA Petoskey stone is a rock and a fossil that is often pebble shaped and composed of a fossilized rugose coral, Hexagonaria percarinata. These coral colonies lived in a shallow sea that covered what is now the Great Lakes area during Devonian time, about 350 million years ago. You will receive the exact piece shown in the photos. Dimensions: 3. 25 L X 1. 75 W x 1 H inches Weight: 0. 33 pounds