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B
ultramarines
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C
feldspars
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D
beryls
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Solution
The correct options are A ultramarines B zeolites C feldspars 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 (NaAlSi3O8)) are three-dimensional networks of aluminosilicates.
Ultramarines is Na8[SiAlO4]6.(S3)2 is also a 3 dimensional silicate.