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allotropy|æˈlɒtrəpɪ|
[mod. ad. Gr. ἀλλοτροπία variation, changeableness, f. ἀλλότροπος of other manner; f. ἄλλος other, different + τρόπος turn (of mind), manner, f. τρέπ-ειν to turn.]
The variation of physical properties without change of substance to which certain elementary bodies are liable, first noticed by Berzelius in the case of charcoal and the diamond.
1850Ansted Elem. Geol. 151 Isomorphism, a converse phenomenon to that of allotropy. 1863Watts Chem. Dict. II. 423 Instances of inorganic isomerism are usually called instances of allotropy..Sulphur, phosphorus, carbon, and many other elements present..examples of allotropy. |