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negative crystal |
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negative crystal [′neg·əd·iv ′krist·əl] (crystallography) A crystal containing a cavity, where the form of the cavity is one of the characteristic crystal forms of the mineral in question. (optics) A uniaxial crystal in which the extraordinary wave travels faster than the ordinary wave, such as calcite. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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