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Cordierite - All About This Gemstone You Need to Know

limz Published On Sun Mar 22 2020   Modified On Sun Mar 22 2020
Cordierite - All About This Gemstone You Need to Know

Cordierite is a magnesium iron aluminum cyclosilicate that exhibits an orthorhombic crystal system. These minerals are composed of magnesium silicate and aluminum. It is mostly known for its remarkable trichroism. These beautiful stones are also known as "Water Sapphire" as they look alike.

Cordierite symbolizes power, leadership, self-confidence, balance, power, strength, kindness, good fortune, and protection.

Let us learn more about Cordierite.


Cordierite, also known as Iolite, is a dark blue mineral and one of the most strongly pleochroic minerals. Cordierite is the name used by geologists and Iolite is the name used in the gem trade. "Water Sapphire" and "Dichroite" are the names that were used in ancient times. 

These stones can balance and open up the third-eye and crown chakra. It helps to deepen our intuitive insight, promote wisdom, develop lucid dreams, improve psychic abilities, and connect us to divine grace.

Origin and History

Cordierite Crystal.
Cordierite Crystal.
Image Source: Pinterest

In 1813, Cordierite was first discovered in Níjar, a Spanish municipality in the province of Almería, Andalusia. It was named after Louis Cordier, a French geologist, and mineralogist. It was believed that thin slices of Iolites were used by ancient Vikings as filters to help locate the sun on cloudy days. Iolite is derived from the ancient Greek word "ios" which means "violet" in reference to its color.

Formation Process

Cordierite commonly occurs in altered aluminous rocks, igneous rocks, and alluvial gravels. It also occurs in schist and gneiss. In schist and gneiss, it forms during regional metamorphism of shales and other argillaceous rocks. These minerals are also found in hornfels and forms during contact metamorphism. 


The chemical formula of Cordierite is (Mg, Fe)2Al3(AlSi5O18). These stones have a hardness of 7-7.5 on the Mohs scale.


The only variety of Cordierite is Iolite.

Colors Available

Blue Cordierite Stones.
Blue Cordierite Stones.
Image Source: Scentual Goddess
  • Grey
  • Blue
  • Blue-Violet
  • Greenish
  • Yellowish Brown
  • Colorless to very light blue

Mines Available

  • Reward Mine, Northern Territory, Australia
  • Siglo Veinte Mine, Potosi, Bolivia
  • Stall Lake Mine, British Columbia, Canada
  • Schoeller Mine, Central Bohemian Region, Czech Republic
  • Les Montmins Mine, Auvergne-Rhône-Alpes, France

Cost Per Carat

The price of Cordierite or Iolite can vary anywhere from $20 to $80 according to its color and quality.


  • Cordierite can be used as an ingredient for making ceramic parts.
  • It can also be used as a gemstone in different forms of jewelry.

Spiritual Properties

  • Cordierite helps to stimulate the imagination, strengthen the entire auric field, promote your intuitive gifts, and guide one through spiritual growth.
  • These stones can treat fever, alleviate migraines, kill bacteria, balance metabolism, reduce fat from the body, improve hair growth, and combat stomachache.
  • It also helps to promote a positive state of mind, bring harmony within the self, overcome codependency within close partnerships, and develop clairvoyance.


Iolite Earrings.
Iolite Earrings.
Image Source: Etsy
  • Cordierite has a vitreous luster and a specific gravity of 2.6-2.66.
  • Just like Tanzanite, these stones are strongly pleochroic stone.
  • It has a brittle tenacity and a sub-conchoidal fracture.
  • It has a fair cleavage on {100}, poor on {001}, and {010}.

Jewelry Stores Near You

  • Alex Monroe, London, United Kingdom
  • Michael Hills, Kamloops, British Columbia, Canada
  • Mociun Fine Jewelry & Home, New York, USA

Online Stores

  • Beaverbrooks, York, England
  • Paris Jewelers, Calgary, Canada

Visit Stoneharu for more information about stones and gems.