Belgian Blue Stone® (BBS)

Blue Belgian Gold

Have you ever heard of our blue gold?

The term blue gold is more widely known to describe water, but the Belgian Blue Stone, a noble material with a grey-blue colour, is so beautiful and precious in our eyes that the name blue gold seems to define it perfectly.

Where does it come from?

The Walloon subsoil hides gold… Blue Gold!

A few metres below the quarrying site of the Carrières de Maffle, this veine de pierre, limestone with a blue appearance, a true “blue gold” appreciated for centuries in our country and in many others, passes through.

Carrières du Hainaut

Carrières de Maffle transforms 90% of the Pierre bleue de Belgique.
They are fortunate to be located less than 30 km from Carrières des Carrières du Hainaut à Soignies, the main supplier.

The bluestone bank emerges from the Walloon subsoil in the Hennuyer basins, the Ourthe-Amblève basins, in the Bocq Valley and in the Molignée Valley.

Comment entretenir la pierre bleue ?

But what exactly is it about?

Belgian Blue Stone is a limestone with a more or less accentuated natural blue-grey colour, characterised by the presence of numerous crinoid debris. It is extracted exclusively in Belgium. This compact limestone of sedimentary origin results from the accumulation of innumerable debris of encrines or crinoids, cemented by a micro-crystalline gangue containing very finely divided carbon which gives the stone its blue colouring.

Belgian Blue Stone is non-rotting and resistant.
It is available in a variety of colours depending on the finish, ranging from light grey to dark grey, almost black, to blue grey. Because it comes from organic material, as soon as the stone is exposed to the outside, the material oxidises and the stone has a greyish appearance.

Like all materials extracted from the ground, it has certain structural characteristics depending on the geological conditions that determined its formation over millions of years. A clear distinction must therefore be made between the particularities of the stone’s appearance that may justify the existence of different commercial categories and the technical defects of Belgian Blue Stone® that fully warrant the removal of the stone affected.

It may contain white filings and/or black or red threads also called veins, bousins, geodes and moieties, white spots, styloliths and fossils. A rigorous selection of blocks and slices is necessary in order to bypass the particularities that may or may not be excluded according to the requirements of the specifications.


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Marbrerie de Soignies | 2021 - Nom marketing : Carrières de Maffle