Online Encyclopedia
Make a correction
Your email address will not appear on the site. Note, comments may take some time to be approved.
Back to article:
DITETRAGONAL PYRAMIDAL
Your email:
Article name:
Article content:
DITETRAGONAL PYRAMIDAL CLASS (Hemimorphic-hemihedral). Here there are two pairs of vertical planes of symmetry intersecting in the tetrad axis. The pyramids {hhll and lhol} and the bipyramid {hkl} are all hemimorphic. Examples are iodosuccimide (C 4H 402N I) , silver fluoride (AgF .H20) , and penta-erythrite (C&H12O4). No examples are known amongst minerals.