chiastolite

noun
chi·​as·​to·​lite | \ kīˈastəˌlīt\
plural -s

Definition of chiastolite

: a mineral consisting of a variety of andalusite whose crystals have a tessellated appearance in cross section due to the arrangement of impurities

called also macle

History and Etymology for chiastolite

German chiastolith, from chiasto- + -lith -lite

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