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Anhydrite crystals are the result of gypsum coming into contact with water that then evaporates
but some manufacturers will make brass and wind instruments from it as well
Average size range: 30 to 60 millimeters
Moroccan geodes produce THE BEST looking geode when cracked open
Tumbled Stromatolite / 20-35mm AVG - 1 LB. LOT menu stars Anhydrite crystals are the resultQuantity: 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.
