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
Zeolites and feldspars (Eg: albite \(\left.\left(\mathrm{NaAlSi}_{3} \mathrm{O}_{8}ight)ight)\) are three-dimensional networks of aluminosilicates.
Ultramarines is \(\mathrm{Na}_{8}\left[\mathrm{SiAlO}_{4}ight]_{6} \cdot\left(\mathrm{S}_{3}ight)_{2}\) is also a 3 dimensional silicate.
Hence, all of the are three-dimensional silicates.
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