Opal has enchanted civilizations from the Romans to Aboriginal Australians. Known as a symbol of hope and creativity, its play-of-color effect makes it one of the most unique gemstones.
Country of Origin
Australia, Ethiopia, Mexico, USA
Color(s)
White, black, blue, orange-red (fire opal)
Chemical Formula
SiO₂·nH₂O
Hardness
5.5
Luster
Waxy
Crystal System
Refractive Index
1.37
Specific Gravity
1.98
Help Guide
Crystal System
Gemstones and minerals are classified into seven primary crystal systems based on their atomic structure.
Refractive Index
The refractive index (RI) of a material measure how much light is bent, or refracted, when entering the material from another medium.
Specific Gravity
The specific gravity (SG) of a substance is a measure of its density compared to water.
Chemical Formula
A chemical formula shows the types and quantities of atoms in a molecule.
