Iolite

Iolite gemstone, also named iolit, iolita, or cordierite stone.

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Iolita

Iolite or cordierite is a magnesium iron aluminium cyclosilicate. Iron is almost always present and a solid solution exists between Mg rich cordierite and Fe rich sekaninaite with a series formula: (Mg,Fe)2Al3(Si5AlO18) to (Fe,Mg)2Al3(Si5AlO18). A high temperature polymorph exists, indialite, which is isostructural with beryl and has a random distribution of Al in the (Si,Al)6O18 rings. This mineral’s fascinating internal structure contributes to its distinct pleochroism and is a key factor in its popularity as a gemstone.

Occurrence

Iolite gemstone, also named iolit, iolita, or cordierite stone, typically occurs in contact or regional metamorphism of pelitic rocks. It is especially common in hornfels produced by contact metamorphism of pelitic rocks. Two common metamorphic mineral assemblages include sillimanite cordierite spinel and cordierite spinel plagioclase orthopyroxene. Other associated minerals include garnet, cordierite garnet sillimanite gneisses, and anthophyllite. Cordierite also occurs in some granites, pegmatites, and norites in gabbroic magmas. Alteration products include mica, chlorite, and talc.

When searching for iolite, geologists often examine these metamorphic environments closely. The presence of hornfels or mineral assemblages rich in aluminium and iron indicates favorable conditions for iolite formation. In some deposits, iolite crystals can be quite large, though transparent gem-quality material is far less common.

Gem variety

The transparent variety of iolite stone is often used as a gemstone. The name comes from the Greek word for violet. Another old name is dichroite, a Greek word meaning two colored rock, a reference to cordierite’s strong pleochroism. It has also been called water sapphire and vikings compass, because of its usefulness in determining the direction of the sun on overcast days, the vikings having used it for this purpose. This works by determining the direction of polarization of the sky overhead.

Light scattered by air molecules is polarized, and the direction of the polarization is at right angles to a line to the sun, even when the sun’s disk itself is obscured by dense fog or lies just below the horizon. Gem quality varies in color from sapphire blue to blue violet to yellowish gray to light blue as the light angle changes. Sometimes used as an inexpensive substitute for sapphire. It is much softer than sapphires and is abundantly found in Australia (Northern Territory), Brazil, Burma, Canada (Yellowknife area of the Northwest Territories), India, Madagascar, Namibia, Sri Lanka, Tanzania and the United States (Connecticut). The largest crystal found weighed more than 24,000 carats and was discovered in Wyoming, US.

As a gemstone, iolite is typically cut into faceted stones that emphasize its pleochroic nature. Expert cutters take advantage of its unique optical properties, orienting the rough material so the most striking color is visible face-up. However, due to its distinct cleavage, care must be taken to avoid chipping or cracking during cutting and everyday wear.

Iolite meaning and properties

The following section is pseudo scientific and based on cultural beliefs.

Indigo Iolit stone combines the intuition of the violet ray with the trust of the pure blue ray. It brings wisdom, truth, dignity and spiritual mastery. A stone of judgment and long life, it promotes introspection and can result in profound wisdom when used well.

On a personal level, many crystal enthusiasts believe iolite encourages self-confidence and greater clarity of thought. Some practitioners suggest that it may enhance inner strength, paving the way for deeper self-exploration and spiritual growth. While these attributes cannot be scientifically proven, they remain a part of the cultural lore surrounding iolite.

FAQ

Is Iolite rare?

Fine stones over 5 carats are rare. The stone falls at 7 to 7.5 on the Mohs hardness scale, but given that it has distinct cleavage in one direction, its toughness is only fair.

What is iolite good for?

Iolita is often referred to as a vision stone. It clears thought forms, opening intuition. It can aid in understanding and releasing the causes of addiction. It may also help you express your true self, free from the expectations of others.

Is Iolite a sapphire?

No. It is a variety of the mineral cordierite, sometimes wrongly named “water sapphire” in its deep blue sapphire color. Like sapphire and tanzanite, iolite is pleochroic, meaning it transmits light differently when viewed from different directions.

Is Iolite expensive?

The best quality of fine blue violet stones range as $20 to $150 per carat depending on the color, cut, and size. Color saturation and clarity heavily impact the value.

Blue or purple Iolite?

Most of the stones are somewhere between the two colors. Sometimes more purple and sometimes more blue. These variations can even shift under different lighting, making iolite particularly intriguing for collectors and jewelry lovers.

Which chakra is iolite good for?

Iolit resonates with the third eye chakra. This stone is reputed to carry strong third eye energies, which is why it is often used to access higher guidance and strengthen intuition. Its unique vibrational qualities are sometimes sought for meditative practices.

Where is raw iolite found?

It is found in Australia (Northern Territory), Brazil, Burma, Canada (Yellowknife area of the Northwest Territories), India, Madagascar, Namibia, Sri Lanka, Tanzania, and the United States (Connecticut). These diverse locations yield crystals that can differ slightly in color and clarity.

Is Iolite a birthstone?

Iolita which is indigo in color is one of the natural birthstones of those born in midwinter (January 20 – February 18). Many who celebrate zodiac stones or alternative birthstones may choose iolite for its unique hue.

What are tumbled iolite stones used for?

Tumbled stones are used as energy stones in alternative medicine. They are also used as healing crystals and as chakra stones. Tumbled stones are often placed on different chakra points to help relieve physical, emotional, mental, and spiritual discomforts. Enthusiasts may carry a tumbled iolite stone in a pocket or purse to keep its perceived energies close throughout the day.

Additional Care & Maintenance

Iolite jewelry should be cleaned gently with mild soap and lukewarm water. It is advisable to avoid ultrasonic or steam cleaners, as the stone’s cleavage can make it vulnerable to sudden temperature changes and harsh vibrations. Storing iolite pieces separately from other jewelry can help prevent scratches. Regular inspection of prongs or settings ensures the stone remains secure over time.

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