Definitions
from The Century Dictionary.
- noun A common mineral, the fluoride of calcium, CaF2, found in great beauty in Derbyshire, England, and hence also called
Derbyshire spar .
Etymologies
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Examples
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_Calcium fluoride_, CaF_2, constitutes the mineral fluor-spar (_q. v._), and is prepared artificially as an insoluble white powder by precipitating a solution of calcium chloride with a soluble fluoride.
Encyclopaedia Britannica, 11th Edition, Volume 4, Part 4 "Bulgaria" to "Calgary" Various
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Of this fluor-spar were formed the celebrated murrhine cups which were in use in Rome in the days of Pliny among the richest people, and for which fabulous prices were paid.
Roman Mosaics Or, Studies in Rome and Its Neighbourhood Hugh Macmillan
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The centers of the fluor-spar cubes become negatively electric by the action of light.
Scientific American Supplement, No. 288, July 9, 1881 Various
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The photo-electric excitability of fluor-spar crystals is increased by a moderate heat (80° to 100° C.).
Scientific American Supplement, No. 288, July 9, 1881 Various
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_Murrha_ was employed, which has been identified with fluor-spar, a translucent crystalline stone marked with blue, red, and purple, similar to the beautiful substance found near Matlock in Derbyshire.
Roman Mosaics Or, Studies in Rome and Its Neighbourhood Hugh Macmillan
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Hantzel has communicated to the Saxon Royal Society of Science some interesting observations on the production of electricity by light in colored fluor-spar.
Scientific American Supplement, No. 288, July 9, 1881 Various
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The most beautiful are those made of fluor-spar, the celebrated Blue John Mine providing the most beautiful specimens.
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Fluorine is frequently met with as calcium fluoride or fluor-spar
A Text-book of Assaying: For the Use of Those Connected with Mines. Cornelius Beringer 1886
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~Fluor~: fluor-spar as free as possible from other minerals, powdered.
A Text-book of Assaying: For the Use of Those Connected with Mines. Cornelius Beringer 1886
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In the case of fluorides free from silicates (such as fluor-spar), it is determined indirectly by decomposing a weighed portion with sulphuric acid, evaporating, igniting, and weighing the residual sulphate.
A Text-book of Assaying: For the Use of Those Connected with Mines. Cornelius Beringer 1886
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