chiastolite slate

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English

Noun

chiastolite slate (plural chiastolite slates)

  1. (mineralogy) A rock formed by contact metamorphism of carbonaceous shale, characterized by prominent cleavage or schistosity and the presence of conspicuous chiastolite crystals in a fine-grained groundmass.

References

  • United States Bureau of Mines, Dictionary of Mining, Mineral, and Related Terms (1996).