Dumortierite: Meaning, Symbolic Properties, Care

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Dumortierite is a blue aluminium borosilicate, described near Lyon at the end of the 19th century. Hard and opaque, it is often sold as blue-tinted quartz; it is associated with speech and patience.

Key points

Colour	blue to blue-violet; sometimes pink or brown; opaque to translucent
Mineral family	silicate (aluminium borosilicate)
Simplified composition	Al7BO3(SiO4)3O3
Mohs hardness	7 to 8 depending on sources
Origin of the name	Lyon palaeontologist Eugène Dumortier
Discovery	1879, Chaponost (Rhône), near Lyon
Deposits	Brazil, Madagascar, United States, France, Sri Lanka, Namibia, Norway
Traditional correspondence	throat chakra and third eye; Air or Water
Care	lukewarm water and soft cloth; robust

What is dumortierite?

Dumortierite is a rare mineral, an aluminium borosilicate with the formula Al7BO3(SiO4)3O3. It most often occurs as masses or very fine fibres, of a deep blue tending towards violet, sometimes pink or brown. It is opaque or barely translucent.

It was discovered in 1879 at Chaponost, near Lyon (Rhône), and named after the Lyon palaeontologist Eugène Dumortier. Its hardness is high, between 7 and 8 according to the authors: it is a resistant stone.

Today, the main sources are Brazil and Madagascar, but it is also found in the United States (Nevada, California), Sri Lanka, Namibia, Norway or Poland.

"Dumortierite quartz", the most common form

In jewellery and lithotherapy, dumortierite often appears as quartz with dumortierite inclusions: a blue, greyish or violet quartz whose colour is carried by fine fibres of the included mineral. In this case, the hardness of the material is that of quartz (around 7). This "dumortierite quartz" is sold as beads, tumbled stones and cabochons, and its marbled look recalls lapis lazuli or sodalite.

It is therefore worth asking: "is this pure dumortierite, or dumortierite quartz?"

Traditional symbolism

Dumortierite was identified in the 19th century: its symbolism is therefore recent and comes from modern lithotherapy, which relies mainly on its blue colour.

It is associated with speech, with the calm expression of what one thinks.
It is linked to patience, order and organisation, because it is dense and stable.
It is sometimes chosen as a study or reflection stone, to be placed on a desk.

These are conventions and personal beliefs, with no proven effect.

Traditional correspondences

Domain	Common association	Note
Chakra	Throat; also third eye	Through its blue colour
Element	Air or Water	Authors differ
Signs	Taurus, Aquarius	According to a few modern lists

How to use it

As jewellery: beads of a necklace or bracelet, a cabochon for a pendant; its hardness allows regular wear. See our guide to stone jewellery.
As a tumbled stone: to keep in a pocket or place on a study desk.
In meditation: held in the hand while breathing slowly, to focus attention.
As a gift: to accompany an exam, a new course of study, a writing project.

Care and cleansing

Water: lukewarm water and a soft cloth, then dry. The stone tolerates water, although porous or dyed materials call for more caution.
Sun: no known concern, but prefer soft light for dyed pieces.
Knocks: the stone is hard, but brittle under a violent blow.
Household cleaners: avoid them, as well as ultrasonic cleaners if the stone is set in a mount.
Symbolic cleansing: gentle smoke, moonlight. See the guide to cleansing and recharging your stones.

How to recognise genuine dumortierite

Genuine dumortierite is opaque or faintly translucent, a deep blue, often with veins, fibres or greyish tones. Several materials can resemble it:

Sodalite: royal blue veined with white, softer (5.5 to 6).
Lapis lazuli: blue with golden flecks of pyrite and white patches of calcite.
Kyanite: blue too, but in pearly blades.
Quartz or chalcedony dyed blue: colour too uniform, concentrated in the fissures.
Blue glass: round bubbles, a lustre that is too regular.

Always ask whether it is pure dumortierite, dumortierite quartz or a dyed stone. To our knowledge, there is no common treatment of natural dumortierite, but this point should be confirmed by the seller. See the guide to choosing and caring for your stones.

How to choose your dumortierite

A deep, even blue is the most appreciated; grey or violet tones are just as authentic.
For jewellery, check that it is the material announced (pure or as quartz).
Tumbled stones and cabochons are easier to find than crystals.
Pairings: sodalite and lapis lazuli for a range of blues; kyanite to compare the structure.