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(mineralogy) A white mineral with triclinic crystals, NaCaB₅O₉·8H₂O, noted for its fibers which transmit light by internal reflection, such that a piece with flat faces perpendicular to the fibers' orientation displays an image of whatever is adjacent to its other side.
Related-word data is supplemented by the Datamuse API. Datamuse results are suggestions, not automatic replacements.