A mineral variety of andalusite with carbonaceous impurities regularly arranged along the longer axis of the crystal.
Origin of chiastoliteFrom Greek kh&imacron;astos, crossed, past participle of kh&imacron;azein, to mark with an X; see chiasma.
Ancient Greek marked with a letter chi + -lite. See chiasm. So called from the resemblance of the crosscuts of its crystals to the Greek letter chi.