rhombohedral


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rhombohedral

[¦räm·bō¦hē·drəl]
(crystallography)
Of or pertaining to the rhombohedral system.
Of or pertaining to crystal cleavage in or a centered lattice of the hexagonal system.
References in periodicals archive ?
2d and e) suggesting that PSDA-b-PEG can totally inhibit the growth of CC rhombohedral crystals at high concentrations.
Note the euhedral and rhombohedral crystal terminations, which may display rough surfaces (detailed photograph).
These parallel lines are attributed to polysynthetic twin planes corresponding to the rhombohedral {1011} faces of corundum.
PZT compositions near the MPB have both high [[euro].sub.r] and high [K.sub.p] This is mainly due to the fact that polarization of the PZT solid solution at the MPB compositor may easily switch between ferroelectric tetragonal and ferroelectric rhombohedral phase, effectively resulting in 14 available equivalent polar directions.
Some clasts are cemented by meso-tocoarse calcite crystals and rhombohedral dolomite crystals.
It usually occurs as rhombohedral crystals developing interpenetration twinning (Figures 6c-6d) In other cases, it has a pseudocubic habit in which angles between their faces are closer to right angles (Figures 6e) Figure 6f gives an example of complexly-twinned (phacolitic) chabazite crystals, showing streaks parallel to the edges of the crystal Natrolite occurring as groups of randomly oriented acicular crystals associated with trapezohedral analcime crystals is illustrated in Figure 6g Nontronite occurs as fine-grained random aggregates of flaky crystals along with trapezohedral analcime crystals (Figure 6h).
TF is manufactured from a proprietary process of heating, cooling and twisting of nickel titanium in the rhombohedral crystalline phase configuration (an intermediate phase between austenite-the phase at rest and martensite-the phase present during function).
Structurally, aragonite is orthorhombic and therefore different from rhombohedral calcite and dolomite; however the C[O.sub.3] group in aragonite is identical to that in the rhombohedral carbonates [2].
The aragonite PCC of orthorhombic habit and calcite PCC of rhombohedral habit show an almost similar trend in coated paper properties with the greatest smoothness and paper gloss.
Another zone of the mine, now being exploited for copper ore, has been turning out lovely baby-blue to turquoise-blue specimens of calcite included by aurichalcite, with sharp rhombohedral crystals to 3.5 cm on dark brown gossan matrix.
[5.] Parthasarathy, G., Sreedhar, B., Chetty, T., "Spectroscopic and X-ray diffraction studies on fluid deposited rhombohedral graphite from the Eastern Ghats Mobile Belt, India".
The shape of the pores between the particles can be tetrahedral or rhombohedral. When particles are distributed cubically, the radius of the pores between the particles is equal to 0.41 R.