Summary: Quantitative electronprobe microanalyses have been made of stannite from various localities. It was found that in general this mineral corresponds in composition to the formula Cu₂FeSnS₄. However, noticeable deviations in the ratio of the metals can occur and considerable concentrations of zinc may be present.

Some tin minerals related to stannite have also been analysed, namely hexastannite, mawsonite, and an apparently hitherto unknown mineral to which the name rhodostannite is given.