Chiastolite (k&iuptack_;ăst&ouptack_;līt), n. [Gr. chiastos 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]