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Line 1: − [[Image:Bismuth_hopper_crystal.jpg|thumb|250px|A hopper crystal of metallic bismuth]]+ − A '''Hopper [[crystal]]''' is one with faces that are [[hollow]]ed as in the "stepped" faces of some [[halite]] crystals. − − ==Sources== − *Pellant, Chris. ''The Complete Book of Rocks and Minerals'', Dorling Kindersley Inc.: New York (1995), ''p. 251'' − − [[category:Crystallography]]
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Never forget, the first syllable in conservative is "con!"