Silicate material have relatively low densities because of the covalent character in the bonds.
The silicate material have relatively low densities because of the presence of the covalent character between the interatomic bonding of Si and O.
This covalent character decreases the packing efficiency of the lattice of the silicates.
Also, because of the presence of the Frenkle effect in the lattice of silicate materials. It is easily founded in the silicates which result in the relatively low densities.
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