Semi-Precious Gemstones

Iolite

Current Market Range

$20 - $200+

Known as the Viking Compass Stone for its optical properties.

India, Sri Lanka, Myanmar, Madagascar

Blue, Violet, Gray

Chemical Formula

Mg₂Al₄Si₅O₁₈

Hardness

0.5

Luster

Vitreous (Glassy)

Crystal System

Orthorhombic

Refractive Index

0.02

Specific Gravity

0.08

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.