Indian sandstone reached UK merchant yards through a small number of consolidators in Rajasthan and stayed there because the supply chain was already built. Shahabad limestone had no equivalent route. It has been the default flooring stone across large parts of India for generations while remaining almost unknown to a UK buyer under forty.
The technical case is straightforward. Abrasion resistance on Shahabad Grey is 18.2 mm against a typical 22 to 26 mm for imported sandstone. Water absorption is under 0.4 per cent against 1.5 to 3 per cent. The stone is denser, it stains less, and it holds a honed finish where sandstone opens up.
The commercial case is that the UK grey paving market is currently served by porcelain and by European limestone at a landed cost that leaves very little margin at merchant level. A directly quarried Indian limestone sits below both without dropping into the quality band buyers associate with unsorted imports.
What has been missing is a supplier who owns the working face and the polishing line. Consolidated supply means the bench changes between containers and colour drifts. Single-source supply means the same bed, worked in sequence, with crate marks that tie back to it.
The opening is real but it closes. Once two or three national merchants have listed a grey Indian limestone as a stock line, the category is defined and later entrants compete on price alone.