0 one of many forms of a chemical element. For example, coal and graphite are different forms of carbon. --
1 one of many forms of a chemical element, for example, coal and graphite (= substance used in pencils) are different forms of carbon --
Technically, graphene is a crystalline allotrope of carbon with 2-dimensional properties.
Effect of heat: it is the most stable allotrope of carbon.
Allotrope is a misnomer, as adamantium is an alloy and not a pure element.
The last would be a high energy allotrope of nitrogen.
The crystalline allotrope is gray and has a metallic luster.
The high-temperature gamma allotrope has a body-centered cubic crystalline structure.
A seventh plutonium allotrope exists at very high pressures.
While this allotrope is occasionally mentioned in the literature, no subsequent work appears to have been published either confirming or discrediting its existence.
