However, five point groups are assigned to two lattice systems, rhombohedral and hexagonal, because both exhibit threefold rotational symmetry.
32.
It crystallizes in the hexagonal crystal system and has been found as primary euhedral di-rhombohedral, pseudo-octahedral crystals.
33.
Due to the high symmetry of the special position, only about 2 wt % Zn is necessary to stabilize the rhombohedral structure.
34.
There was a single, central fin which blended into a rhombohedral rudder; its cut-away underside provided for elevator movement.
35.
Cooling below the Curie temperature produces a rhombohedral distortion wherein the rhombohedral angle changes from 60?( cubic phase ) to 60.53?
36.
Cooling below the Curie temperature produces a rhombohedral distortion wherein the rhombohedral angle changes from 60?( cubic phase ) to 60.53?
37.
The free-energy difference between the two stacking configurations scales quadratically with electric field, favoring rhombohedral stacking as the electric field increases.
38.
Acute scalenohedral crystals are sometimes referred to as " dogtooth spar " while the rhombohedral form is sometimes referred to as " nailhead spar ".
39.
Both crystallize in the ditrigonal pyramidal ( hemimorphic-hemihedral ) class of the rhombohedral system, possessing the same degree of symmetry as tourmaline.
40.
Also, it possesses dual quality of translucent to cleavage and distinct rhombohedral cleavage with hackly fracture, on the other side spherulitic grains are conchoidal.
