Sentence Examples

  • Crystals of arsenic belong to the rhombohedral system, and have a perfect cleavage parallel to the basal plane; natural crystals are, however, of rare occurrence, and are usually acicular in habit.
  • Quartz crystallizes in the trapezohedral-hemihedral class of the rhombohedral division of the hexagonal system.
  • The basal plane, so common on calcite and many other rhombohedral minerals, is of the greatest rarity in quartz, and when present only appears as a small rough face formed by the corrosion of the crystal.
  • Haematite crystallizes in the rhombohedral system, and is isomorphous with corundum (Al203).
  • The habit of the crystals may be rhombohedral, pyramidal or tabular, rarely prismatic. In fig.

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