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Glossary of Minerals Terms
beginning with letter F
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feldspar
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noun
  1. (mineralogy) A large group of rock-forming minerals that, together, make up about 60% of the earth's outer crust. The feldspars are all aluminum silicates of the alkali metals sodium, potassium, calcium and barium. Feldspars are the principal constituents of igneous and plutonic rocks.
feldspathic
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adjective
  1. (mineralogy) Containing feldspar.
fluor
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noun
  1. fluorite, Fluorite.
fluoric
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adjective
  1. (chemistry) Pertaining to, obtained from or containing fluorine.
fluorite
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noun
  1. a widely occuring mineral, (calcium fluoride), of various colours, used as a flux in steelmaking, and in the manufacture of glass, enamels and hydrofluoric acid
fool's gold
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noun (-, sg=fool's gold)
  1. A mineral or other substance often mistaken for gold, mainly used for iron pyrite.
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