1.(Min.) A yellowish white, translucent mineral, consisting of the carbonates of lime and soda, with water.
gaylussite
gaylussite
[′gā·lə‚sīt] (mineralogy) Na2Ca(CO3)2·5H2O A translucent, yellowish-white hydrous carbonate mineral, with a vitreous luster, crystallizing in the monoclinic system; found in dry lakes.