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A Gypsum Rosette is a mineral which crystallizes in a unique rosette growth pattern. Gypsum Rosettes can be found all across the world. They form very fast in terms of geological time. They are created in a span of only decades to hundreds of years. Gypsum is an evaporite, which means its crystals form during the evaporation of water. The crystals are shaped like prisms or flat plates. Some rosettes even form large clusters comprised of many small rosette crystals which are the general color of the sand. In order for gypsum rosettes to form they must have an arid environment, a large source of calcium sulfate, and a seasonal fluctuation of water. (source: Gypsum Rosette, by John Gresham) Photo by Michael Marcotte Return to List Back to Michael's Hobbies page Back to Michael Marcotte's HomePage