4. The silicate minerals are comprised of the complex anion referred to as the s

Question

4. The silicate minerals are comprised of the complex anion referred to as the silica tetrahedron, and the crystal structure for each mineral is primarily defined by the arrangements of the tetrahedra. Below, describe the silica tetrahedron and include in your description the type of bonding, chemical formula, and net charge of the tetrahedron. Then identify a mafic and a felsic silicate mineral, and for each mineral name the structural arrangement of the tetrahedra and identify the chemical elements that make up each mineral (chemical formula not required) Define silica tetrahedron: Mafic mineral: Structure Elemental Felsic mineral: Structure: Elemental components: components:

Explanation / Answer

Feldspar is a group of rocks with silica tetrahedron structure.

Net charge is -4.

Type of chemical bonding is ionic bond.

Chemical formula: KAlSi3O8 – NaAlSi3O8 – CaAl2Si2O8

KAlSi3O8

Components: Potassium, Aluminium, Silicon, Oxygen.

NaAlSi3O8 – CaAl2Si2O8

Components: Sodium, Aluminium, Calcium, Silicon, Oxygen.

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