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syhedrite

syhedrite Min.
  (saɪˈhiːdraɪt)
  [Improperly for *syhadrite, f. the Syhadree Mountains in Bombay, where found: see -ite1.]
  A mineral of uncertain composition, supposed to be related to stilbite.

1865 Shepard in Amer. Jrnl. Sci. Ser. ii. XL. 110 Syhedrite. I have thus named, from its locality... The mineral occurs in trap at Thore-Ghat, in the Syhedree Mountains, Bombay.

Oxford English Dictionary

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