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silicite

silicite Obs.
  [f. L. silic- silex1 + -ite1 2 b.]
  Labradorite, or a variety of this.

1843 T. Thomson in Philos. Mag. Ser. iii. XXII. 190 The fourth mineral..I have distinguished by the name of Silicite, from the great resemblance which it has to quartz in its external aspect. 1850 Ansted Elem. Geol., Min. etc. 193 Glaucolite and Silicite are other varieties [of Labradorite].

Oxford English Dictionary

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