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* v$ b7 F5 q! R) @: i6 I ~- C% FCOVER Polarized light micrograph of a thin section of gypsum crystals (CaSO4•2H2O). Vertical field of view ~4 millimeters. This natural and industrial mineral unexpectedly crystallizes from solution at room temperature upon a transition through a precursor, nanocrystalline bassanite (CaSO4•0.5H2O), a usually high-temperature phase. A detailed understanding of this crystallization route could lead to a new strategy to control gypsum scale and may open an alternative route for the production of "plaster of Paris" (bassanite). Photo: Alfred Pasieka/Photo Researchers, Inc. ; b: e* n' i; p$ m S' y
" o! v# Y* w% ]
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发表于 2012-4-6 22:41
发表于 2012-4-7 11:16
