Iolite
A variety of Cordierite
What is Iolite?
Iolite is a blue to violet silicate mineral found in igneous and metamorphic rocks. Generally, the material has little commercial use. Synthetic iolite is used for making ceramic parts used in catalytic converters. The clear variety is called iolite, and it's cut as a gem and used in the jewelry industry.
Uses & Applications
The most transparent and inclusion-free specimens of iolite are used in the gem industry, as this hard mineral can be cut into faceted gemstones for use in necklaces, rings, and other decorative jewelry in a similar way to Sapphire. While some of these gems are quite breathtaking, they may not be as popular because many samples are hard to cut well; the stone appears differently colored from different angles.
Healing Properties
Disorders of the liver are said to be healed by iolite, and the belief is that the stone diminishes sleep problems. Iolite may alleviate the symptoms of rheumatism and stomach acidity. Its supposed connection with the third eye chakra means it serves to magnify motivation and increase willpower. It's also said to aid the removal of harmful habits.
Optical Properties
- Refractive Index
- 1.542-1.578
- Birefringence
- 0.008-0.012
- Pleochroism
- Strong trichroism: colorless to yellowish, pale blue, violet-blue
- Optical Character
- Biaxial positive or negative
- Dispersion
- 0.017
Discover Values
Iolite Market Value Calculator
Estimate the market value of Iolite using size, quality, and finish. This preview calculator is for quick context and is not a formal appraisal.
Iolite Localities Map
See where Iolite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Associated Chakras
Quick Facts
Physical Properties
- Color
- Blue to blue–violet
- Hardness (Mohs)
- 7 - 7.5
- Density
- 2.58 - 2.66 g/cm³
- Streak
- White
- Luster
- Greasy, Vitreous
- Crystal System
- Orthorhombic
Chemical Properties
- Chemical Formula
- (Mg,Fe)2Al3(AlSi5O18)
- Elements
- Al, Fe, Mg, O, Si
Also Known As
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