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

diamond

graphite

fullerene

anthracite

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.

Paweł Kołodziejczyk

3

Jeffrey Beall wikipedia → Carbon#Allotropes

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