Definitions
from The Century Dictionary.
- noun A name applied to any of the very numerous crystallized and cleavable varieties of calcite; calcareous spar.
from the GNU version of the Collaborative International Dictionary of English.
- noun Same as
calcite .
Etymologies
Sorry, no etymologies found.
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Examples
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The statement that a crystal of calc-spar consists of carbonate of lime, is quite true, if we only mean that, by appropriate processes, it may be resolved into carbonic acid and quicklime.
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If you pass the same carbonic acid over the very quicklime thus obtained, you will obtain carbonate of lime again; but it will not be calc-spar, nor anything like it.
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Can it, therefore, be said that chemical analysis teaches nothing about the chemical composition of calc-spar?
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The end surfaces and also the cut carried through the prism are parallel to the principal axis of the calc-spar.
Scientific American Supplement, No. 441, June 14, 1884. Various
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It is considered by Dr. Feussner to be the most perfect prism capable of being prepared from calc-spar.
Scientific American Supplement, No. 441, June 14, 1884. Various
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The mineral had, however, long been known under the names calcareous spar and calc-spar, and the beautifully transparent variety called Iceland-spar had been much studied.
Encyclopaedia Britannica, 11th Edition, Volume 4, Part 4 "Bulgaria" to "Calgary" Various
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The external form of the prism may thus be similar to the Hartnack, the calc-spar being replaced by glass.
Scientific American Supplement, No. 441, June 14, 1884. Various
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The latter advantage, however, occurs only when the difference between the indices of refraction for the ordinary and extraordinary rays in the particular crystal made use of is greater than in calc-spar.
Scientific American Supplement, No. 441, June 14, 1884. Various
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A ray of light, on entering the prism, is separated by the double refraction of the calc-spar into an ordinary and an extraordinary ray; the former undergoes total reflection at the layer of balsam at an incidence which allows the extraordinary ray to be transmitted; the latter, therefore, passes through unchanged.
Scientific American Supplement, No. 441, June 14, 1884. Various
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Dr. Feussner remarks that a prism similar in some respects to his new arrangement was devised in 1869 by M. Jamin (_Comptes Rendus_, lxviii., 221), who used a thin plate of calc-spar inclosed in a cell filled with bisulphide of carbon; and also by Dr. Zenker, who replaced the liquid in M. Jamin's construction by wedges of flint glass.
Scientific American Supplement, No. 441, June 14, 1884. Various
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