<P> The mica group of sheet silicate ( phyllosilicate ) minerals includes several closely related materials having nearly perfect basal cleavage . All are monoclinic , with a tendency towards pseudohexagonal crystals , and are similar in chemical composition . The nearly perfect cleavage , which is the most prominent characteristic of mica , is explained by the hexagonal sheet - like arrangement of its atoms . </P>
<P> The mica group of sheet silicate ( phyllosilicate ) minerals includes several closely related materials having nearly perfect basal cleavage . All are monoclinic , with a tendency towards pseudohexagonal crystals , and are similar in chemical composition . The nearly perfect cleavage , which is the most prominent characteristic of mica , is explained by the hexagonal sheet - like arrangement of its atoms . </P>
the cleavage properties of mica result form the -
the cleavage properties of mica result form the -
hexagonal sheet - like arrangement of its atoms
hexagonal sheet - like arrangement of its atoms