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Which statement is wrong?

1. Feldspars are not aluminosilicates
2. Beryl is an example of cyclic silicate
3. Mg2SiO4 is orthosilicate
4. Basic structural unit in silicates is the SiO4 tetrahedron

Correct answer: Feldspars are not aluminosilicates

Solution

Feldspars are aluminosilicates, so the statement in option A is incorrect. The other options correctly describe the respective silicate types and structures.

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