chiastolite

[kahy-as-tl-ahyt]
noun
a variety of the mineral andalusite having cruciform carbonaceous inclusions.

Origin:
1795–1805; alteration of chiastolith (see -lite), equivalent to Greek chiastó(s) set crosswise (see chiasma) + -lith

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chiastolite (kaɪˈæstəˌlaɪt)
 
n
Also called: macle a variety of andalusite containing carbon impurities
 
[C19: from German Chiastolith, from Greek khiastos crossed, marked with a chi + lithos stone]

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Example sentences
Some of the crystals show a cross pattern and dark center typical of the chiastolite variety.
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