Aerinite

3D Model

A blue mineral containing iron and magnesium, found in the Pyrenees. It was used as a pigment by a number of Romanesque master painters, and is the blue of the Pantocrator from Sant Climent de Taüll. Its name comes from a Greek root “aerinos,” meaning “atmosphere” or “sky”.

Vikipedia: Aerinite (Ca4(Al,Fe,Mg)10Si12O35(OH)12CO3·12H2O) is a bluish-purple inosilicate mineral. It crystallizes in the monoclinic system and occurs as fibrous masses and coatings. It has a dark, vitreous luster, a specific gravity of 2.48 and a Mohs hardness of 3.