Allotropy

Diamond an graphite are twa allotropes o carbon: pure forms o the same element that differ in creestalline structur.

Allotropy or allotropism (frae Greek ἄλλος (allos), meanin 'ither', an τρόπος (tropos), meanin 'manner, form') is the property o some chemical elements tae exeest in twa or mair different forms, in the same pheesical state, kent as allotropes o thir elements.