The Collaborative International Dictionary
MgOSiO2
Unisilicate \U`ni*sil"i*cate\, n. [Uni- + silicate.] (Min.) A salt of orthosilicic acid, H4SiO4; -- so called because the ratio of the oxygen atoms united to the basic metals and silicon respectively is 1:1; for example, Mg2SiO4 or 2 MgO.SiO2.