chiastolite slate
English edit
Noun edit
chiastolite slate (plural chiastolite slates)
- (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 edit
- United States Bureau of Mines, Dictionary of Mining, Mineral, and Related Terms (1996).