D defs.my
Entry 1 sense Webster, 1913

Chiastolite

/(kī̇*ăs"tō̇*līt)/ · Chi·as·to·lite · IPA
01 n. A variety of andalusite; -- called also macle. The tessellated appearance of a cross section is due to the symmetrical arrangement of impur…
  1. 1.
    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.(Min.) Also: macle