unisilicate
/ˌjuːnɪˈsɪlɪkət/ /ˌjuːnɪˈsɪlɪkeɪt/Mineralogy. Now disused
noun
Any silicate regarded as a compound of silica and a protoxide or sesquioxide of a metal, with equal numbers of oxygen atoms in the two components.
Origin
Mid 19th century; earliest use found in James Dana (1813–1895), geologist, zoologist, and teacher. From uni- + silicate.