Rock-crystal sentence example

rock-crystal
  • Obsidian and rock crystal were also used for knife making.

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  • The intention would seem to have been to imitate vessels of rock crystal.

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  • They are made usually of crown glass or rock crystal ("pebbles"), the latter being somewhat lighter and cooler to wear.

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  • He fell upon a most ingenious plan of doubling the amount of double refraction of a prism by using two prisms of rock-crystal, so cut out of the solid as to give each the same quantity of double refraction, and yet to double the quantity in the effect produced.

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  • There appears, however, to be some objection to the use of iridio-platinum for weights, as, owing to its great density (Δ=21.57), the slightest abrasion will make an appreciable difference in a weight; sometimes, therefore, quartz or rock-crystal is used; but to this also there is some objection, as owing to its low density (Δ=2.65) there is a large exposed surface of the mass.

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  • Air, flint, glass, rock-crystal, calcareous spar were examined, but without effect.

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  • It is contained in a rock-crystal shrine, encased in silver, and is vested in full pontifical robes blazing with jewels.

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  • Besides copper, according to Strabo, the island produced considerable quantities of silver; and Pliny records it as producing various kinds of precious stones, among which he mentions diamonds and emeralds, but these were doubtless nothing more than rock crystal and beryl.

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  • The various forms of silica have attracted attention from the earliest times, and the water-clear crystallized variety was known to the Greeks as KOo-raXXos (clear ice), being supposed by them to have been formed from water by the intense cold of the Alps; hence the name "crystal," or more commonly rock-crystal, applied to this variety.

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  • Clear transparent rock-crystal is used for optical purposes and spectacle lenses.

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  • A few magnificent specimens of rock-crystal twinned according to this law have been found at La Gardette in Isere, and in Japan they are somewhat abundant.

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  • Further, these varieties may be of almost any colour, whereas transparent crystals have only a limited range of colour, being either colourless (rock-crystal), violet (amethyst), brown (smoky quartz) or yellow (citrine).

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  • There appears, however, to be some objection to the use of iridio-platinum for weights, as, owing to its great density (Δ=21.57), the slightest abrasion will make an appreciable difference in a weight; sometimes, therefore, quartz or rock-crystal is used; but to this also there is some objection, as owing to its low density (Δ=2.65) there is a large exposed surface of the mass.

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  • April - Ever-popular diamonds are the stones for those born in April, with rock crystal serving as an alternate.

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