What is Iolite?
Iolite is a transparent, violet-blue, light blue, or yellow-gray mineral. It’s primarily found in Sri Lanka, India, and Madagascar. Iolite is often used as a gemstone and is popular for its pleochroic property, showing different colors when viewed from different angles.
Iolite is a captivating gemstone that comes in shades of violet-blue to light blue. Its unique pleochroic property makes it a popular choice for jewelry like rings and pendants, as it shows different colors depending on the angle of view.
|Chemical Classification||Inorganic - Silicate|
|Color||Typically blue to violet, but can show yellowish-gray or honey color from different angles due to its pleochroism.|
|Transparency||Transparent to translucent.|
|Occurrence||India, Sri Lanka, and Madagascar.|
|Formation||Formed under high temperature and pressure conditions in regional metamorphic rocks.|
|Cleavage||Perfect in one direction|
|Mohs Hardness||7 - 7.5.|
|Specific Gravity||Approximately 2.58 - 2.66.|
|Diagnostic Properties||Pleochroism (different colors when viewed from different angles).|
|Pleochroism||Strong; shows different colors when viewed from different angles.|
|Crystal System||Orthorhombic (variety of Cordierite)|
|Optical Properties||Biaxial (-)|
|Refractive Index||1.522 - 1.578|
|Birefringence||0.008 - 0.012|
|2V angle||Measured: 78° to 82°|
|Dispersion||0.008 - 0.012.|