锇（Osmium，旧译作銤[1]、鐭）是一种化学元素，符号为Os，原子序为76。锇金属坚硬、易碎，呈蓝白色。锇属于铂系过渡金属，是自然界中密度最高个元素，密度有22.59 g/cm3。锇一般以痕量存在于自然中，大部份拉铂矿藏个合金当中。锇托铂、铱搭其渠铂系元素形成个合金具有超强个耐用性搭硬度，能用拉制造钢笔笔头搭电触头等。[2]
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