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Roman Glass

Glass

By Tim Matthews, JD, FGA, GG, DGA,
CEO and President of JTV (retired)
Published: June 2014
Modified: November 2021
Roman Glass Jewelry
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Table of Contents
  • General Information
  • Roman Glass Colors
  • Countries of Origin

Roman Glass is actual glass that has been buried for 2,000-years in mineral-rich soil. Archeological sites located near Jerusalem serve as the main source of Roman glass, notably because Israel once served as a major glass-making center. A thin layer of patina naturally forms on the glass as minerals in the soil react with the glass. The natural process of oxidation creates the various shades of blues and greens on the surface. As the coloration depends on the mineral condition to which the glass is exposed, each piece is unique.

General Information

  • Classification
  • Optical Properties
  • Characteristic Physical Properties
  • Chemistry & Crystallography
Common Name
Roman Glass
Species
Glass
Transparency
Opaque-Transparent
Dispersion
Strength: Moderate if Contains Lead Value: 0.009
Refractive Index
Over The Limit 1.470-1.700 Tolerance: Can go OTL
Optic Character
NA
Optic Sign
NA
Polariscope Reaction
Aggregate (AGG), Anomalous Double Refraction (ADR)
Fluorescence
SWUV: Variable
LWUV: Variable
Pleochroism
None
Hardness
5-6
Toughness
Poor
Inclusions
Air bubbles, flow lines
Luster
Vitreous, Subvitreous
Fracture
Conchoidal, Granular, Splintery
Cleavage
None
Chemical Name
Silica
Crystal System
NA

Roman Glass Colors

  • Bi-color Roman Glass
    Bi-color
  • Black Roman Glass
    Black
  • Blue Roman Glass
    Blue
  • Brown Roman Glass
    Brown
  • Colorless Roman Glass
    Colorless
  • Gray Roman Glass
    Gray
  • Green Roman Glass
    Green
  • Multi-color Roman Glass
    Multi-color
  • Orange Roman Glass
    Orange
  • Pink Roman Glass
    Pink
  • Purple Roman Glass
    Purple
  • Red Roman Glass
    Red
  • White Roman Glass
    White

Countries of Origin

Unknown; Italy

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