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 for Zircon syenite
From The Collaborative International Dictionary of English v.0.48 :

  Zircon \Zir"con\, n. [F., the same word as jargon. See Jargon
     a variety of zircon.]
     1. (Min.) A mineral consisting predominantly of zirconium
        silicate ({Zr2SiO4) occurring in tetragonal crystals,
        usually of a brown or gray color. It consists of silica
        and zirconia. A red variety, used as a gem, is called
        hyacinth. Colorless, pale-yellow or smoky-brown
        varieties from Ceylon are called jargon.
        [1913 Webster +PJC]
     2. an imitation gemstone made of cubic zirconia.
     Zircon syenite, a coarse-grained syenite containing zircon
        crystals and often also elaeolite. It is largely developed
        in Southern Norway.
        [1913 Webster]

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