How many of the following are 3D-silicates Quartz, Tridimite, Feldspar, Zeolite crystobalite, Ultramerine.

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answer is 6.

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Detailed Solution

When all the four corners of a tetrahedron are shared with other tetrahedral, the three-dimensional network structure is obtained. Since all the oxygen atoms are shared, these silicates are neutral

Ex: Quartz, Tridimite, Feldspar, Zeolite crystobalite, Ultramerine.

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