Very fine-grained, generally sooty graphite from metamorphosed coalbeds. The word amorphous is a misnomer because all graphite is crystalline. The term has also been applied to very fine particles of flake graphite that can be sold only for low-value uses (such as foundry facings), and to fine-grained varieties of Ceylon lump graphite. AGI
Source:
Dictionary of Mining, Mineral, and Related Terms












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