A naturally occurring mineral material used as a building and paving material in Mesoamerica since antiquity.

plural of go-away-bird

(photography) A system of three (not five) mirrors used as a cheaper substitute to a pentaprism in the viewfinders of some single-lens reflex cameras

(mineralogy) A monoclinic-prismatic mineral containing barium, fluorine, hydrogen, iron, manganese, oxygen, silicon, and titanium.