Allotropy:  or allotropism (from Ancient Greek ἄλλος (allos), meaning ‘other’, and τρόπος (tropos), meaning ‘manner, form’) is the property of some chemical elements to exist in two or more different forms, in the same physical state, known as allotropes of the elements.

Source: Italian

Ref: JA


Sustanza minerali

English: Also called potash alum, potassium alum. a crystalline solid, aluminum potassium sulfate