Silicon and oxygen compounds {silicate mineral} are hard and are 1/3 of all minerals. SiO2 [2 is subscript] is triangular. Silicon dioxide is in granite and obsidian. It forms at 600 C to 900 C. It has density 2.7 g/cm^3. SiO4 [4 is subscript] is tetrahedral. Silicon oxides can have another form {tridimyte}. Silicates can be nesosilicate, sorosilicate, cyclosilicate, inosilicate, phyllosilicate, or tektosilicate.
Physical Sciences>Earth Science>Mineral>Kinds>Silicates
5-Earth Science-Mineral-Kinds-Silicates
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Date Modified: 2022.0224