Definitions

from The Century Dictionary.

  • noun A salt of orthosilicic acid (H4SiO4). Zinc orthosilicate (Zn2SiO4 or 2ZnO. SiO2) is the mineral willemite: it is often called a unisilicate, since it has an oxygen ratio of 1:1.

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

  • noun chemistry any salt or ester of orthosilicic acid, (M+)4SiO44− or Si(OR)4
  • noun mineralogy any silicate mineral, such as garnet or olivine, in which the SiO4 tetrahedra do not share oxygen atoms with each other

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