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制备目的:帮助学生认识晶体是自然形成的具 有一定几何形状的固体。 晶体形态:明矾为三方晶系,复三方偏三角面 体对称式。结晶呈菱面体。(正八面 体)最大的一颗边长3厘米。重28.5 克。胆矾为三斜晶系,三斜轴面对 称式,结晶为小板状体(侧棱柱体) 边长2.7厘米,重16.7克。 制作过程:在洁净的烧杯里,用高于室温12～ 15℃的热水溶解化学纯的胆矾(或 明矾)。制成胆矾(或明矾)的饱和 溶液。
Preparation purposes: To help students recognize that crystals are naturally formed solids with a certain geometry. Crystal morphology: Alum is a trigonal system, complex trigonal trigonal plane symmetry. The crystal is rhombohedral. (Octahedron) The largest side is 3 cm long. Weighs 28.5 grams. The biliary cistern is triclinic, the triclinal axis is weighed, and the crystal is a small plate-like body (side prism) with a side length of 2.7 cm and a weight of 16.7 grams. Production process: In a clean beaker, chemically pure cholesteric (or alum) is dissolved in hot water at a temperature of 12-15°C above room temperature. Made into a saturated solution of bile (or alum).