3lbs 15oz. 107mm or 4.25" approximately. Kona dolomite with stromatolite sphere.
Kona Dolomite, found in Michigan's Kona Hills, is a Precambrian rock famous for its ancient stromatolites, which are layered structures formed by cyanobacteria. These stromatolites are among the earliest known fossils and are found within the dolomite, a type of sedimentary rock. The Kona Dolomite's unique characteristics make it a valuable specimen for geological study and a fascinating piece of natural history.
