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hyalophane

[hahy-al-uh-feyn, hahy-uh-luh-]
noun Mineralogy.
  1. a variety of orthoclase in which some of the potassium is replaced by barium.
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Origin of hyalophane

First recorded in 1850–55; hyalo- + -phane
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018