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
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
 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 -  
 
                                        Black -  
 
                                        Blue -  
 
                                        Brown -  
 
                                        Colorless -  
 
                                        Gray -  
 
                                        Green -  
 
                                        Multi-color -  
 
                                        Orange -  
 
                                        Pink -  
 
                                        Purple -  
 
                                        Red -  
 
                                        White 
Countries of Origin
Unknown; Italy