a colorless variety of opal, sometimes transparent like glass, and sometimes whitish and translucent.

1785–95; hyal- + -ite1

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World English Dictionary
hyalite (ˈhaɪəˌlaɪt)
a clear and colourless variety of opal in globular form

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Example sentences
In the wide parts of the veinlets, late hyalite and uranium-bearing aragonite are present.
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