The basic structural unit of feldspar, zeolites, mica, and asbestos is :
Hydrated alumino silicate having negative charge which is balanced by cations such as Na+, K+ or Ca2+
Compounds with basic unit SiO44-, each Si atom is linked to four oxygen atom tetrahedrally, joined by corners
(i) chemical formula zeolite: .It is also known as hydrated aluminium silicate.
(ii) Mica : It is a potassium aluminium silicate .
(iii) asbestos: It is a hydrous magnetium silicate with the chemical composition: .
(iv) Feldsbar is a potassium silicate and there are various sub-types of feldsbar are available in earth crust.
silicate is a general name given to a group of minerals which have silicon-oxygen bonds with general formula
option (3) is correct
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