chiastolite

[kahy-as-tl-ahyt]

noun

1. a variety of the mineral andalusite having cruciform carbonaceous inclusions.

chiastolite

/ kaɪˈæstəˌlaɪt /

noun

1. Also called: macle. a variety of andalusite containing carbon impurities

Word History and Origins

Origin of chiastolite¹

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

Word History and Origins

Origin of chiastolite¹

C19: from German Chiastolith, from Greek khiastos crossed, marked with a chi + lithos stone

Example Sentences

The andalusite may be pink and is then often pleochroic in thin sections, or it may be white with the cross-shaped dark enclosures of the matrix which are characteristic of chiastolite.

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Macle, mak′l, n. a kind of twin crystal: a kind of cross-stone or hollow-spar, called also Chiastolite, having the axis and angles of its crystals coloured differently from the rest.—adj.

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The granites pass into gneiss and granulite; the gabbros into flaser gabbro and amphibolite; the slates often contain andalusite or chiastolite, and show transitions to mica schists.

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In the vicinity of intrusive granites slates become converted into hornfelses containing biotite, chiastolite or andalusite, sillimanite and a variety of other minerals; limestones recrystallize as marbles, and all rocks, according to their composition, are more or less profoundly modified in such a way as to prove that they have been raised to a high temperature by proximity to the molten intrusive mass.

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The rocks consist of a clay-slate, with crystals resembling chiastolite and crystals of sulphide of iron interspersed.

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