| This would be quite in accordance with the chemical notion of allotropy. |
| Thus carbon occurs as the diamond, and as charcoal and plumbago, and is therefore regarded as a substance subject to allotropy. |
| Important for the uniqueness of steel is the allotropy of iron that is, its existence in two crystalline forms. |
| And this hypothesis is entirely in harmony with the phenomena of allotropy. |
| Before leaving this phase of inorganic chemistry, we may mention other historical examples of allotropy. |
| With the exception of nitrogen, all group V elements show allotropy. |
