Historical & Geological Context
Known scientifically as crinoidal limestone, Pierre Bleue Belge has been quarried in Soignies and the Hainaut basin since the Middle Ages. Its high mineral density, dark blue-grey color, and petrified crinoid fossils offer unmatched durability against freeze-thaw cycles. Essential for heritage door surrounds, steps, water basins, and plinths across the Low Countries.
Petrographic & Geological Characteristics
Dense crinoidal limestone (Carboniferous Tournaisian), deep blue-grey to black when polished, fossiliferous.
Lime Mortar & Breathability Compatibility
Bed in non-staining hydraulic lime (NHL 3.5 or trass lime) to prevent efflorescence.
Provenance & Historical Sourcing
Hainaut basin, Wallonia, Belgium; certified Petit Granit origin.
Condition Report & Patina
Extremely dense and frost-resistant; takes fine bush-hammered, flamed, or honed velvet finishes.
Pierre Bleue Belge (Petit Granit du Hainaut)
Hainaut, Belgium (BE)
Non-commercial reference. Not sold or brokered by Le Cercle du Roi.
This material dossier is compiled from public geological surveys, heritage conservation research (BRGM, CTMNC, Historic England, Monumentenwacht), and historical treatises. Inclusion does not constitute a sales offer by Le Cercle du Roi.