Mármol negro de Markina Curiosity · Markina-Xemein, Lea-Artibai / Markina-Ondarroa, Bizkaia Image of Markina-Xemein, not of the place itself. The quarries of the Kalamua and Urko mountains, of limestone origin, produce the so-called black marble of Markina, which has competed internationally with Carrara marble. Photo: Ksarasola (CC BY-SA 4.0) What to see and do in Markina-Xemein