Flake graphite site na nnukwu nrụgide metamorphism, n'ozuzu bluish isi awọ, ihu igwe na-acha aja aja ma ọ bụ isi awọ na-acha ọcha, na-emepụtakarị na neiss, schist, crystalline limestone na skarn, mineral symbionic dị mgbagwoju anya, isi akụrụngwa ...
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