See also:

• BIPYRAMIDAL

BIPYRAMIDAL CLASS (Parallel-faced aemihedral)  . Here there is a See also:

• PLANE

plane of .symmetry perpendicular to the hexad See also:

• AXIS (Lat. for " axle ")

axis; there is also a centre of symmetry . All the closed forms are hexagonal bipyramids; the open forms are hexagonal prisms or the basal pinacoid . The See also:

• GENERAL
• GENERAL (Lat. generalis, of or relating to a genus, kind or class)

general See also:

• FORM (Lat. forma)

form Ihikl} is hemihedral with parallel faces with respect to the general form of the See also:

• HOLOSYMMETRIC

holosymmetric class . See also:

• APATITE

Apatite (q.v.), See also:

• PYROMORPHITE

pyromorphite, See also:

• MIMETITE

mimetite and See also:

• VANADINITE

vanadinite possess this degree of symmetry .