紫(zi)銅(tong)(tong)又名紅銅(tong)(tong)就是(shi)銅(tong)(tong)單質，因(yin)其顏色為(wei)紫(zi)紅色而得名。各種性質見銅(tong)(tong)。紫(zi)銅(tong)(tong)是(shi)工業純銅(tong)(tong)，其熔點為(wei)1083℃，無同素異構轉變，相對密度(du)為(wei)8.9，為(wei)鎂的五倍。同體積的質量比普通鋼重(zhong)約15%。因(yin)其具有(you)玫瑰紅色，表面(mian)形成氧(yang)(yang)化膜后呈紫(zi)色，故一般(ban)稱為(wei)紫(zi)銅(tong)(tong)。它是(shi)含有(you)一定(ding)氧(yang)(yang)的銅(tong)(tong)，因(yin)而又稱含氧(yang)(yang)銅(tong)(tong)。