Ca-Mg tourmalines from Brumado are either OH-dominant (uvite) or F-dominant (fluor-uvite). Although fluor-uvite is much more abundant at the locality, dealers tend to just traditionally label everything "uvite" (and some tourmalines might not even belong to that series... some dravites are also present there).

Very few specimens destined for the collector market are analyzed, and since tourmalines may be zoned anyway, it might not do a lot of good to bother analyzing everything in any case. It also doesn't help that the IMA originally considered "uvite" as the F-dominant end-member, and later changed their mind and decided the root name should go with the rarer OH-dominant species (so watch out topaz... your days without a "fluor-" prefix are numbered... lol).