Plavi mineral od magnezijuma, železa, aluminijuma, silicijuma i kiseonika, često korišćena kao dragi kamen.
ETYM Named after the geologist Cordier.
A blue mineral of vitreous luster and strong dichroism that consists of a silicate of aluminum, iron, and magnesium.
A blue mineral of magnesium, iron, aluminum, silicon, and oxygen; often used as a gemstone.
Silicate mineral, (Mg,Fe)2Al4Si5O18, blue to purplish in color. It is characteristic of metamorphic rocks formed from clay sediments under conditions of low pressure but moderate temperature; it is the mineral that forms the spots in spotted slate and spotted hornfels.