Tumbled Stromatolite / 20-35mm AVG - 1 LB. LOT menu stars and the basalt eventually wears

and the basalt eventually wears away to leave the geode behind

75" wide X

Anhydrite crystals are the result of gypsum coming into contact with water that then evaporates

Amethyst Gemstone Metal Water Bottle with Black Sleeve

Tumbled Stromatolite / 20-35mm AVG - 1 LB. LOT menu stars and the basalt eventually wearsQuantity: 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.