Aerinite from Soriana Quarry, Spain

Aerinite from Soriana Quarry, Estopiñán del Castillo, Huesca, Aragon, Spain

Blue-green specimens of Aerinite from the Soriana Quarry, Spain.

Aerinite is an uncommon inosilicate mineral that was historically used as a blue pigment, particularly in religious murals in France and Spain.

Aerinite from this locale occurs as crusts (typically over dolerite), but most of the specimens don't show much else in the way of other minerals or matrix rock.