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[floo r-ahyt, flawr-, flohr-] /ˈflʊər aɪt, ˈflɔr-, ˈfloʊr-/
a common mineral, calcium fluoride, CaF 2 , occurring in green, blue, purple, yellow, or colorless crystals, usually in cubes: the principal source of fluorine, used also as a flux in metallurgy and for ornament.
Also called fluor, fluorspar, fluor spar.
Origin of fluorite
From Italian, dating back to 1865-70; See origin at fluor-, -ite1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for fluorite
Historical Examples
  • Only certain varieties of fluorite show the phenomenon well.

    The Nature of Animal Light E. Newton Harvey
  • Some specimens of fluorite (CaF2) show the phenomenon especially well, whence the name fluorescence.

    The Nature of Animal Light E. Newton Harvey
  • Agricola derived the name fluores from fluo "to flow," and we in turn obtain "fluorite," or "fluorspar," from Agricola.

    De Re Metallica Georgius Agricola
  • Rays passing through the fluorite window strike the blackened side of the mica, which is parallel and opposite to it.

    Inventors at Work George Iles
  • In England, fluorite is obtained in this manner as a by-product from lead and zinc mines.

  • fluorite is widely distributed, most commonly in vein deposits, often associated with metallic ores.

    Geology William J. Miller
  • Some fissure veins of fluorite in limestone in southern Illinois are twenty to forty feet wide.

    Geology William J. Miller
British Dictionary definitions for fluorite


(US & Canadian) a white or colourless mineral sometimes fluorescent and often tinted by impurities, found in veins and as deposits from hot gases. It is used in the manufacture of glass, enamel, and jewellery, and is the chief ore of fluorine. Composition: calcium fluoride. Formula: CaF2. Crystal structure: cubic Also called (in Britain and certain other countries) fluorspar, fluor
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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fluorite in Science
A transparent to translucent mineral occurring in many colors, especially yellow and purple, and usually in cube-shaped crystals with octahedral cleavage. It is found in sedimentary rocks and in ore deposits within igneous rocks. It is often fluorescent in ultraviolet light. Chemical formula: CaF2.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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