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  1. The existence of a substance, esp. an element, in two or more different modifications usually in the same phase, such as different crystalline forms of carbon, iron, phosphorus, and sulfur. Webster 3rd
  2. Polymorphism in a chemical element; e.g., isometric and hexagonal carbon (diamond and graphite), monoclinic and orthorhombic sulfur (rosickyite and sulfur). An allotrope is one of the crystal forms. Syn: allotropism
    Source: Dictionary of Mining, Mineral, and Related Terms

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