GNU Collaborative International Dictionary of English

Found one definition

      
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

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