Why do minerals that have the nonsilicate crystalline structure called closest packing have high density?

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The native elements of a nonsilicate crystal have very high densities because their crystal structures are based on the packing of atoms as close together as possible.

igneous rocks which formed by the crystallization of magma at the surface of the earth called extrusive rocks. they are characterized by fine-grained textures because the rapid cooling at or near the surface did not provide enough time for large crystals to grow.