Definitions

Bernabé & Luján 2008: bronze
Chadwick & Ventris 1973: bronze, cf. χαλκός
Palaeolexicon: copper
Wiktionary: copper

References

Bernabé, Alberto and Eugenio Luján, 2008 A Companion to Linear B: Mycenaean Greek Texts and their World (editors Yves Duhoux and Anna Morpurgo Davies) "Mycenaean Technology"

Chadwick, John and Michael Ventris, 1973 Documents in Mycenaean Greek