augite
Concise Oxford English Dictionary © 2008 Oxford University Press:
augite /ˈɔːdʒʌɪt/
▶noun a dark green or black aluminosilicate mineral found in many igneous rocks.
– origin C19: from L. augites, denoting a precious stone, from Gk augitēs, from augē ‘lustre’.
'augite' also found in these Oxford entries:

