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countable and uncountable, plural amphibolites
Any of a class of metamorphic rocks composed mainly of amphibole with some quartz etc. quotations examples
At that time, the Gondwana supercontinent was located at the southern part of the Southern Hemisphere, developed amphibolite metamorphism and formed the united crystalline basement at about 510 Ma.
2020, Tianfeng Wan, The Tectonics and Metallogenesis of Asia, Springer Nature, page 113