紫(zi)(zi)銅(tong)(tong)又(you)名紅銅(tong)(tong)就是(shi)(shi)(shi)銅(tong)(tong)單質，因其顏色(se)為(wei)紫(zi)(zi)紅色(se)而(er)得名。各(ge)種性質見銅(tong)(tong)。紫(zi)(zi)銅(tong)(tong)是(shi)(shi)(shi)工業(ye)純銅(tong)(tong)，其熔(rong)點為(wei)1083℃，無同素異構轉變，相對密度為(wei)8.9，為(wei)鎂(mei)的(de)五倍(bei)。同體積的(de)質量比普(pu)通鋼(gang)重約15%。因其具有玫瑰紅色(se)，表面形成氧化(hua)膜后(hou)呈紫(zi)(zi)色(se)，故(gu)一般稱為(wei)紫(zi)(zi)銅(tong)(tong)。它是(shi)(shi)(shi)含有一定氧的(de)銅(tong)(tong)，因而(er)又(you)稱含氧銅(tong)(tong)。