Caption
Kona Dolomite, (CaMg(CO3)2) from Marquette County, Michigan. Kona Dolomite is an ancient rock in which formations of fossil stromatolite (blue-green algae) occur. The stone is between 2.1 to 2.2 billion years old. These stromatolite formations are from some of the first life on earth.
Availability
Only inBelgium, Canada, France, Luxembourg, Switzerland