Wiktionary
native aluminium
n. (context geology English) Aluminium metal, rarely found in nature in oxygen deficient environments such as volcanic mud.
Wikipedia
Native aluminium
Native aluminium (IMA1980-085a) is a natural occurrence of aluminium. Its (co)-type localities are the Billeekh intrusion and the dike OB-255, Sakha Republic.
Usage examples of "native aluminium".
Geologists from the Shenyang Institute of Geology announced that they had found grains of 'native aluminium' in Guizhou Province.