Feldspars are three dimensional aluminosilicates.

Boron nitride (BN) is known as inorganic graphite. The most stable form is hexagonal one. It has layered structure similar to graphite.

SiO$$_4^{4 - }$$ orthosilicate is basic unit of silicates.

Since Me₃SiCl contains only one Cl, therefore it can’t form high molecular mass silicon polymer. It can form only dimer.