Which of the following is not an allotropic variety of coal?

diamond
756
graphite
764
fullerene
2480
anthracite
2678
An allotropy is a phenomenon of appearing, in the same state of aggregation, of all sorts varieties of the same chemical element, differing in physical properties and chemical. Coal is appearing mainly in the form of diamond, graphite, fullerene and graphene. Anthracite is simply a variety of the hard bituminous coal.
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Paweł Kołodziejczyk
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