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hieratite

hieratite Min.
  (ˈhaɪərətaɪt)
  [a. It. hieratite (A. Cossa 1882, in Atti d. R. Accad. dei Lincei (Trans.) VI. 141), f. Hiera, ancient name of Vulcano, one of the Lipari Islands: see -ite1.]
  A colourless or greyish fluoride of potassium and silicon, K2SiF6, occurring in stalactitic concretions in the crater of Vulcano and on Vesuvius.
  The abstract cited in quot. 1882 consistently spells the word hieralite, although Cossa's form was -tite.

1882 Jrnl. Chem. Soc. XLII. 705 For this natural fluosilicate he proposes the name hieralite, from Hiera, the Greek name for the island Vulcano. Hieralite is associated in the concretions with selensulphur, realgar, mirabilite, [etc.]. 1951 C. Palache et al. Dana's Syst. Min. (ed. 7) II. 104 Hieratite is isostructural with the corresponding salts of Rb, Cs, Tl, and NH4.

Oxford English Dictionary

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