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The chemical composition of the feldspar group is __________

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The chemical composition of the feldspar group is __________

(a) Oxide

(b) Aluminates

(c) Silicates

(d) Aluminosilicates

I have been asked this question by my school principal while I was bunking the class.

My question comes from Formation and Descriptive Study of Minerals topic in portion The Study of Minerals of Engineering Geology

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Right answer is (d) Aluminosilicates

For explanation: In chemical composition, felspars are chiefly aluminosilicates (also referred as alumosilicates) of Na, K and Ca with the following general formula, WZ4O8, in which W=Na, K, Ca and Ba and Z= Si and Al.

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