There are some independent minerals of Cd, which are secondary minerals formed during weathering and leaching, such as greenockite, otavite and oxides of Cd in the oxidized zone of the deposit.

镉主要以类质同象存在于闪锌,镉以硫镉等独立物形式存在于床带，是风淋滤过程形成镉次生物。

It is thought that greenockite is a seconday (supergenic) mineral, but there has been found primary greenockite in the Niujiaotang cadmium-zinc deposit in Guizhou.

在贵州牛角塘镉锌床既有次生硫镉存在,也发现了原生硫镉。