Glass network mosaic fragment late 1st century B.C.-early 1st century A.D. Roman Body fragment of thin glass.Colorless, with opaque white.Almost flat.Seven narrow parallel canes decorated with two spirally twisted threads.Many pinprick bubbles; exterior polished; linear pitting of surface bubbles; one patch of creamy iridescent weathering on interior; rounded, weathered edges.. Glass network mosaic fragment. Roman. late 1st century B.C.-early 1st century A.D.. Glass; cast. Early Imperial. Glass