Example of a three-dimensional silicate is

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(C) Feldspars are the most abundant aluminosilicate minerals on the Earth's surface. In these structures,silicon and aluminium atoms occupy the center

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Feldspars

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(C) Feldspars are the most abundant aluminosilicate minerals on the Earth's surface. In these structures,silicon and aluminium atoms occupy the centers of interlinked tetrahedra of $SiO_4^{4-}$ and $AlO_4^{5-}$. These tetrahedra connect at each corner to other tetrahedra,forming an intricate,three-dimensional,negatively charged framework. Cations like $Na^+$,$K^+$,or $Ca^{2+}$ occupy the voids within this structure.

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