锡石是一种矿物名，集合体呈不规则粒状。主产于锡石石英脉和锡石硫化物矿床中，当原生锡矿床经风化破坏后，常形成砂矿。锡石是炼锡的主要原料。

Cassiterite is a tin oxide mineral, SnO₂. It is generally opaque, but it is translucent in thin crystals. Its luster and multiple crystal faces produce a desirable gem. Cassiterite has been the chief tin ore throughout ancient history and remains the most important source of tin today.