1
Shapes rhomboidal, perchance rhombohedral-whoknows?
2
There are recent reports of weak ferromagnetism in graphite and synthetic carbon materials such as rhombohedral C(60) (ref.
3
The inclusions in the igneous matrix are unusual in that all possible crystalline morphologies for corundum are present: bipyramidal, prismatic, tabular, and rhombohedral.
4
The crystals belonged to rhombohedral space group R3 with a = 291.4 A and alpha = 61.9 degrees.
5
A remarkable case of enclosed impurities is presented by the so-called Fontainbleau limestone, which consists of crystals of calcite of an acute rhombohedral form (fig.
1
Boron atoms are found in trigonal prisms formed by metal atoms.
2
Lithium ions intercalate into a WO 3 crystal framework and occupy trigonal cavity sites during the electrochemical polarization.
3
The trigonal crystal forms contain one virion per unit cell and the orthorhombic form contains two particles per cell.
4
The difference between the two trigonal crystal forms is 1.1 degrees in the orientation of the virus particle as determined from the rotation function.