An alloy or compound containing both copper and manganese, used in various industrial and metalworking applications.
From Latin 'cuprum' (copper) combined with 'manganese' (from Magnesia, a region in Greece). Developed as alloys for specific industrial purposes.
Copper-manganese alloys are used in coins and marine hardware because they resist corrosion better than pure copper, which is why some coins last centuries while others tarnish quickly.
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