enantiomorphic variety

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Soma cube — The Soma cube is a solid dissection puzzle invented by Piet Hein during a lecture on quantum mechanics conducted by Werner Heisenberg. Seven pieces made out of unit cubes must be assembled into a 3x3x3 cube. The pieces can also be used to make a… … Wikipedia
Crystal habit — This article is about the descriptive term used in mineralogy. For the addictive drug, see crystal methamphetamine. Pyrite sun (or dollar) in laminated shale matrix. Between tightly spaced layers of shale, the aggregate was forced to grow in a… … Wikipedia

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