GNU Collaborative International Dictionary of English

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Found 2 definitions 

  1.       

    Chiastolite , n. [Gr. χιαστός marked with a χ + -lite. See Chiasm. So called from the resemblance of the cross cuts of its crystals to the Greek letter χ.] (Min.) A variety of andalusite; -- called also macle. The tessellated appearance of a cross section is due to the symmetrical arrangement of impurities in the crystal.
    1913 Webster
    
      
    
  2.       

    Macle , n. [L. macula a spot: cf. F. macle. Cf. Mackle, Mascle.] (Min.) (a) Chiastolite; -- so called from the tessellated appearance of a cross section. See Chiastolite. (b) A crystal having a similar tessellated appearance. (c) A twin crystal.
    1913 Webster

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