Tumbled Stromatolite / 20-35mm AVG - 1 LB. LOT Menu Arrowhead Average size range: 40 to

Average size range: 40 to 90 millimeters

Weight: 92 g

After eventually getting exposed to air these nodules dried out and cracked

a mineral usually found in igneous rock and the upper mantle below the Earth's crust

Crystal River Gems - Misfit Boxes

Tumbled Stromatolite / 20-35mm AVG - 1 LB. LOT Menu Arrowhead Average size range: 40 toQuantity: 1 pound Average size range: 20 to 35 millimeters Stromatolites are layered sedimentary stones formed by photosynthetic bacteria. These bacteria form mineral layers by cementing local stone, sand, and gravel together over long periods of time. These structures can reach over 3 feet tall, and fossilized stromatolites are useful records of Precambrian life in paleontology.