This very large Petoskey Stone weights about 3 pounds, 14 ounce and was found near Petoskey, MI. The stone is about 7 1/4” wide x 5” deep x 3 1/4” high as shown in the first photo. It has been ground and polished, by hand, on lapidary equipment.

Due to the large area on the face that I could not polish, I used mineral oil to darken and better show the stone in this area. Photo 1 has no mineral oil and only photo 2 has the mineral oil added to only this unpolished area. If desired, the mineral oil can be removed with soap and a toothbrush. Except for photo 2, all other photos show the stone with no oil.

All photos were taken indoors, except for photo 2 and the last two photos were taken outdoors in the sun. Photos 21 shows the bottom of the stone which has been left natural. The photos show the entire stone. As can be seen this is 100% Petoskey Stone! Stones of this size are rare!

In 1965 the State stone of MI became the Petoskey. The stone is fossilized rugose coral Hexagonaria. I have been collecting these stones for over 50 years

If you have any specific request for natural or polished Petoskey Stones please send me a message.

I do not use anything to enhance the color or anything else regarding my stones. They are collected and left natural or are ground and polished. As described, this stone did have mineral oil painted on a small area.