Rhombohedral sentence example

rhombohedral
  • They all crystallize in the monoclinic system, often, however, in forms closely resembling those of the rhombohedral or orthorhombic systems. Crystals have usually the form of hexagonal or rhomb-shaped scales, plates or prisms, with plane FIG.

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  • There are perfect cleavages parallel to the rhombohedral faces, and the crystals exhibit a strong negative double refraction, like calcite.

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  • Hot or dilute cold solutions deposit minute orthorhombic crystals of aragonite, cold saturated or moderately strong solutions, hexagonal (rhombohedral) crystals of calcite.

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  • It is readily soluble in water, and on evaporation in a vacuum over caustic lime it deposits colourless, rhombohedral crystals of 2KHS.H 2 0.

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  • The Helena crystals are of tabular habit, being composed of the basal pinacoid with a very short hexagonal prism, whilst at Yogo Gulch many of the crystals affect a rhombohedral habit.

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  • It crystallizes in the rhombohedral system.

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  • Siderite, or spathic iron ore, FeCO 3, crystallizes in the rhombohedral system and contains 48.28% of iron.

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  • Distinct crystals are rarely met with; these are rhombohedral and isomorphous with arsenic and bismuth; they have a perfect cleavage parallel to the basal plane, c (111), and are sometimes twinned on a rhombohedral plane, e (1 ro).

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  • Haematite crystallizes in the rhombohedral system, and is isomorphous with corundum (Al203).

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  • The habit of the crystals may be rhombohedral, pyramidal or tabular, rarely prismatic. In fig.

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  • Quartz crystallizes in the trapezohedral-hemihedral class of the rhombohedral division of the hexagonal system.

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  • 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.

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  • 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.

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  • The host substructure is a distorted form of the rhombohedral tunnel structure of the high-temperature phase.

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  • In the rhombohedral crystal, the unit cell contains six molecules of insulin.

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