polysilicate

from The Century Dictionary.

• noun A salt which may be viewed as containing two or more combining units of silicon dioxid combined with the oxid or oxids of more basic elements or radicals, as orthoclase, KAlSi₃O₈ or K₂Al₂Si₆O₁₆ = K₂O.-Al₂O₃.(SiO₂)₆.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun chemistry Any of many polymeric silicate structures typically found in rocks and minerals