'Cu<sub>2</sub>S is the chemical formula of chalcocite, mainly valued as an ore of this metal'
copper
ORES: Cu<sub>2</sub>S is the chemical formula of chalcocite, mainly valued as an ore of this metal
Cu<sub>2</sub>S is the chemical formula of chalcocite, mainly valued as an ore of this metal
Cu<sub>2</sub>S is the chemical formula of chalcocite, mainly valued as an ore of this metal
ORES
copper
ORES