The Mineral Dumortierite
Dumortierite from Rocks Rich in Aluminium
The mineral dumortierite was first identified in 1881 by a French mineralogist who named it in honour of palaeontologist Eugene Dumortier [1803 - 1873]. Although best known as a blue coloured stone dumortierite can also be violet, pink or brown.
Blue dumortierite is sometimes mistaken for the mineral sodalite and stones have also been used to imitate lapis lazuli. Lapis is much rarer hence considerably more expensive but it's really not difficult to tell one from the other.
Dumortierite is found in metamorphic rocks rich in aluminium. The finest grades can be exceptionally beautiful and often feature a mass of long slender crystals embedded within the mineral quartz. Dumortierite crystals have a vitreous lustre, are generally quite small and may exhibit pleochroism with colours varying from red to blue to violet.
Commercial grade stones used for decorative purposes are in fact quartz that's heavily included with dumortierite.
Dumortierite can be found in several countries around the world. A relatively hard stone it grades 8 on Mohs scale of mineral hardness.
Inclusions of dumortierite in quartz
When used for its metaphysical properties dumortierite is said to be beneficial for patience and slowing down aggravated and irritable energies. It can also be used to calm excitable behaviour and stubbornness.
Dumortierite stimulates communication between the body's various systems and can help with the expression of spiritual ideas and the comprehension of hidden meanings. It helps to resolve opposing points of view and when placed on the throat chakra can encourage open communication and the desire to share advice.
Our photograph at the top of the page is dumortierite in pyrophyllite. Although similar to the mineral talc it features aluminium instead of magnesium. Housed in London's Natural History Museum it comes from Namibia in south west Africa (photo; Stone Mania).
The second photo courtesy of Stan Celestian features inclusions of dumortierite in quartz. The crystals are from Bahia in Brazil. The dumortierite in our final photo is on display in the Smithsonian Museum of Natural History, Washington D.C. All photos are clickable and redirect to the original non-compressed image.