ioliten.
/ˈʌɪəlʌɪt/ Mineralogy.
A silicate of aluminium, iron, and magnesium, occurring in short orthorhombic crystals, or granular; of various shades of blue or violet-blue, and commonly showing different colours in different directions; very subject to alteration by exposure, giving rise to many varieties. Also called cordierite n. or dichroite n.
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the world > the earth > minerals > types of mineral > silicates > cyclosilicates > [noun] > cordierite
water sapphire1698
dichroite1810
iolite1810
cordierite1814
peliom1820
saphir d'eau1820
weissite1836
indialite1954
1758 Sir J. Hill (title) An Account of a Stone [etc.]..with the History of the Iolithos, or Violet Stone, of the Germans.]
1810 Jrnl. Nat. Philos. Nov. 235 The denomination of yolite (violet stone).
1821 R. Jameson Man. Mineral. 193 Prismato-Rhomboidal Quartz, or Iolite.
1831 D. Brewster Treat. Optics xxx. 249 M. Cordier observed the same change of colour in a mineral called iolite, to which Haüy gave the name of dichroite.
1868 J. D. Dana Syst. Mineral. (ed. 5) §287 Iolite..Lustre vitreous. Pleochroic, being often deep blue along the vertical axis, and brownish yellow or yellowish gray perpendicular to it.
This entry has not yet been fully updated (first published 1900; most recently modified version published online March 2022).
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n.1810