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Pieces measure approximately 15-40mm
5 to 3 Inches)
and it ranges in color from black or grey to brown or red depending on how much the iron has oxidized over time and the presence or absence of water while it formed
Size: 5-20 mm
Tumbled Stromatolite / 20-35mm AVG - 1 LB. LOT Menu Rough Stones Pieces measure approximately 15-40mmQuantity: 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.
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