Complex ion composed of silicon ion surrounded by four oxygen ions. Negative charge of 4 units, and represented by symbol (SiO4)4-. Diagnostic unit of silicate minerals, and makes up central building unit of nearly 90 percent of materials of earth's crust.
Source: Leet, L. Don. 1982. Physical Geology, 6th Edition. Englewood Cliffs, NJ: Prentice-Hall
 









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