Introduction: foitite is a tourmaline family mineral and belongs to the 'vacancy' group, based on the absence of atoms in the X site. The mineral can be further divided into fluor-, hydroxyl- or oxy varieties, depending on the filling of the W site in the crystals lattice (see tourmaline entry for more details).

Occurrence in Wales: although several occurrences of tourmaline have been reported from Wales (see tourmaline entry), a lack of detailed optical or analytical data has precluded most of these from being classified to mineral species level. New data (National Museum of Wales & A.G. Tindle, unpublished data) confirms the presence of foitite in at least one of these occurrences. As more microprobe data becomes available it is anticipated that a more widespread distribution of foitite in Wales will be demonstrated.

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