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leucophane

leucophane Min.
  (ˈl(j)uːkəfeɪn)
  [Named by Esmark, 1840, f. late Gr. λευκοϕάνης, f. λευκό-ς white + ϕαν-, ϕαίνεσθαι to appear, from its often showing whitish reflections.]
  Silicate of glucium, calcium, and sodium. Also leuˈcophanite.

1844 Dana Min. 235 Leucophane occurs in syenite with albite. 1868 Ibid. (ed. 5) 260 Leucophanite.., crystals tabular and nearly rectangular. 1891 T. S. Hunt Min. Phys. 327 With these is also placed leucophanite.

Oxford English Dictionary

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