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Iron-boracite from the English Zechstein IRON-BORACITE, (Fe, Mg, Mn)aBTO13CI, has been found in nodules in an anhydritic shale that overlies the sylvinite (sylvine-halite rock) of the third Zechstein Evaporite Cycle at the Boulby Mine, Loftus, Saltburn, Cleveland. This is the first record of the mineral in this country. The succession in the type roadway is:Anhydritic shale with the iron-boracite nodule bed near its base; the Shale and NoduleBeds are cross-cut by red sylvine-halite veins from the sylvinite below: 2 m.Pink-grey sylvinite with red and pink sub-horizontal colour bands; 2 m.Coarse-grained red and white halite with streaked-out fragments of anhydrite at its top; 3 m.