Pietra Grey Marble has background colour of greyish-black together with some white veins on the surface. It is considered as one of the most famous marbles. This marble is also internationally well-known and has been given different names such as Gregiro marble, Grafite marble and Graphite Marble.
It is a stone with a gray background and irregular gray and white lines. The porcelain and crystal material of this stone has a very good luster, so this stone has a beautiful light reflection and despite its very excellent analysis, it is one of the best crystal stones in the world.
Marble is a metamorphic rock formed when limestone is exposed to high temperatures and pressures. Marble forms under such conditions because the calcite forming the limestone recrystallises forming a denser rock consisting of roughly equigranular calcite crystals.