a compound formed by replacing hydrogen in an acid by a metal (or a radical that acts like a metal)

a brown to violet-brown, or reddish-brown bladed group of minerals composed of calcium aluminium boro-silicate, (Ca,Fe,Mn)3Al2BO3Si4O12OH.

an inorganic compound with the chemical formula Ca2SiO4; it is used as an anti-caking agent in food preparation and an antacid.

a blue, green, or reddish-brown feldspar mineral of the plagioclase series: used as a decorative stone..