Petoskey Stone (polished)-A natural citrine crystal and is usually a dark

and is usually a dark grey

which resembles droplets of blood on a dragon

can give aventurine a shimmering luster

"Labradorescence" describes this optical property unique to labradorite

and typically colorless quartz

Petoskey Stone (polished)-A natural citrine crystal and is usually a darkA 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