| 释义 |
joaquinite Min.|wɑː-, wəʊˈkiːnaɪt, ˈdʒəʊəkwɪnaɪt|
[f. Joaquin, the name of a ridge in San Benito County, California: see -ite1.]
A honey-yellow to brown silicate of sodium, barium, iron, and titanium that occurs as small, isolated, orthorhombic crystals.
1909G. D. Louderback in Bull. Dept. Geol. Univ. Calif. V. 376 Joaquinite... A honey yellow or light brown substance in small generally individual crystals or crystal grains..which is believed to be a new mineral. 1932Amer. Mineralogist XVII. 308 (heading) The chemical nature of joaquinite. Ibid. 312 There are, therefore, 4 molecules of composition NaBa(Ti, Fe)3Si4O15 in the unit cell of joaquinite. 1967Ibid. LII. 1762 An apparently new rare-earth mineral of the joaquinite group occurs in nephelin—syenite pegmatites of Ilimaussaq alkaline massif (S. Greenland). Optical and X-ray properties are the same, as for standard joaquinite Na Ba Ti3 Si4 O15 from California, but the chemical analysis is quite different... The formula is NaBa2Fe2+Ce2Ti2Si8O26(OH). |