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Webster 1913 Edition

Noun.

[Gr.

ὕαλοσ

glass: cf. F.

hyalite

(Min.)

A pellucid variety of opal in globules looking like colorless gum or resin; – called also

Müller’s glass

Noun.

Muller's glass. It consists chiefly of silex,and is white, sometimes with a shade of yellow, blue or green.

hyalite ‎(plural hyalites)

form of opal