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Most elements that are crystaline, once isolated can exhibit the standard crystal structure associated with their atomic structure. However, if you can control the crystalation process well enough, you can stack on crystal on top of another like they are playing "Leap Frog." these Hopper Crystals form some very striking formations that people collect. http://www.theodoregray.com/PeriodicTable/Elements/083/index.s7.html
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