11. In silicate minerals composed of silicon-oxygen tetrahedra, there is a net c

Question

11. In silicate minerals composed of silicon-oxygen tetrahedra, there is a net charge imbalance asso- ciated with these structures, i.e., (+4) +4x (-2)--4. Which of the following are ways that this charge mbalance is eliminated within silicate crystals? (A) adding Fet2, Mgt2/or other positive ions to the crystal structure; (B) sharing corners of the tetrahedra; (C) substituting Mg*2 at the center of the tetra- hedra; (D) A and B (but not c) are ways in which the charge imbalance is eliminated. .

Explanation / Answer

The answer is option A. By adding positive ions to the crystal structure, the charge imbalance is eliminated.

Sharing corners of the tetrahedron doesnot eliminate the charge and by substituting any other ion at the centre, the mineral no longer remains a silicate.

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