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COVER 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. ) N+ n0 g4 _6 x2 `* G: x* G( Q$ _
# H; W- _& s( W% Z3 \3 b9 ]
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发表于 2012-4-6 22:41
发表于 2012-4-7 11:16
