hyalite

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hy·a·lite

 (hī′ə-līt′)
n.
A clear colorless opal.

[Greek hualos, glass + -ite.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

hyalite

(ˈhaɪəˌlaɪt)
n
(Minerals) a clear and colourless variety of opal in globular form
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

hy•a•lite

(ˈhaɪ əˌlaɪt)

n.
a colorless variety of opal, sometimes transparent like glass, and sometimes whitish and translucent.
[1785–95; < Greek hýal(os) glass + -ite1]
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