Marbled glass
Glass Dictionary

Glass decorated with streaks of two or more colors, resembling marble. Marbled glass was a Venetian specialty from the 15th to 17th centuries, but it was also made in other times and places. Venetian marbled glass is known as calcedonio.
Alternate Spellings:
slag glasses
slag-glass
slag-glasses
Term Variations:
Slag glass
Artwork Examples: