Flint layers, embedded in the chalk cliffs near the Channel coast, were washed down by the sea, moved on the seafloor and shaped round flint pebbles. These pebbles gathered near the coast. The are quarried and processed by washing and sorting In a calcining process in shaft kilns at 1600°C , the flint is converted to Cristobalite.
Crushing, sieving and optical sorting yield several product lines, which are used in road construction (brightening up of traffic ways), in road markings as to improve the grip, in building materials like coatings, paints, spacks and in polymer concrete. The main features of Cristobalite are a very high whiteness, wet and dry opacity, an excellent light reflection, as well as weather stability and safety against algues and funghi. The particle shape ensures a solid anchoring in white concrete and polymer concretes.