Ayrshire Bauxitic Clay – An allochthonous deposit? – S.K. Monro, F.C.Loughnan and M.C. Walker. 1944 – 1967 – Bauxite Clay, Dubbs Quarry, Saltcoats. (Note – SBH – I believe this was operated by the Ayrshire Bauxitic Clay Company Ltd. Did they also possibly supply Adams-Pict Fire Brick Works, Scotswood, Newcastle?)
Found Newcastle upon Tyne.
Produced at the Adams-Pict Firebrick Works at Swalwell, (the site of the earlier Ramsay works on the River Derwent, a tributary of the Tyne and some three miles west of Gateshead), these (INSO) insulating bricks were produced from a mixture of clay, sawdust and diatomite, (a soft, siliceous, sedimentary rock, easily crumbled to form a fine powder), and intended to form a secondary, heat-retaining layer behind the actual firebrick.
Info – … In 1923, Adamsez of Scotswood bought the yard and traded under the name Adams-Pict firebrick Company. Fireclay was brought here from Scotswood and Scotland, to produce PICT a, PICT H, Adams-Pict, and Pict-Inso bricks …
(Note – SBH – I have added the Scottish tag here as although the bricks themselves were manufactured in Northumbria, much of the clay was mined in Scotland)