of aluminum tubing forms the crane's support structure.
A final flurry of moves produces an octahedron
again, now turned inside out.
Depending on the material, these Wulff shapes may have the form of a cylinder, a cube, an octahedron
or some other polyhedron.
It is known that Mn[O.sub.2] can exist in different structural forms, [alpha]-, [beta]-, [gamma]-, [delta]-, [epsilon] and [lambda]-types and so forth, when the basic structural unit ([Mn[O.sup.6]] octahedron
) is linked in different ways.
Besides spherical nanoparticles, 0D [Fe.sub.3][O.sub.4] nanomaterials with other morphologies have been prepared, such as octahedron
[19, 33, 34], dodecahedron , and cube [35-37].
Again here we have black cubic crystals (some with small octahedron
faces), again occurring in calcite seams in grayish green chlorite schist, but these crystals are not at all smooth-faced; rather, their faces are complexly adorned with angular patterns of ridges, grooves and channels--most interesting and attractive.
The specimen consists of a pale greenish gray 2.5-cm octahedron
, slightly rough-faced, on a white drusy quartz matrix.
At this stand, too, was a very fine Chinese green fluorite octahedron
, lacking the oil of some of the Chinese fluorite specimens, so it actually looks nice.
The Argyle diamond crystals in the collection featured here are a lovely, gemmy brown, 1.1-cm octahedron
weighing about 4.4 carats, and a smaller but sharper, purplish brown octahedron
measuring 6 mm.
The coordination polyhedron around Cu(II) can be described as an octahedron
with slightly distorted.
Of the five Platonic solids, only the cube and the icosahedron allow for arrangements of trajectories that can form strictly fine regular stars even for charged particles, provided these have equal masses and absolute values for oppositely charged particles (neither tetrahedron, nor octahedron
can form these).