endialyte, eudyalite

[Ger. eudialyt, from Gr. eu =easily, and dialyō -to part asunder, to di olve: eu =well, and lyo to loosen, to di olve, in allusion to the facility with which it di olves in acids.] Min.: A rhombohedral red mineral of vitreous luster, translucent or nearly so; its hardne 5.5; its specific gravity 2.90 to 3.01. Composition: Silica, 45-70 to 54'10; zirconia, 10.90 to 15.60; sesquioxide of iron, 6:37 to 7.86; sesquioxide of manganese, 1.15 to 2.93; lime, 9-23 to 12-06; soda, 11.40 to 13.92, . There are two varieties: Eudialyte proper, of which the double refraction is positive, and Eucolite in which it is negative. Found in Arkansas, North Green land, and in Norway.