Deep blue dumortierite was first described in 1881 for an occurrence in Chaponost, in the Rhône-Alps of France and named for the French paleontologist Eugène Dumortier (1803–1873). It typically occurs in high temperature aluminium rich regional metamorphic rocks, those resulting from contact metamorphism and also in boron rich pegmatites. It's often mistaken for lapis lazuli and s used in the manufacture of high grade porcelain. Sources of Dumortierite include Austria, Brazil, Canada, France, Italy, Madagascar, Namibia, Nevada, Norway, Poland, Russia and Sri Lanka. In this country it's found in the Yuma, Arizona and San Diego, California areas. But the best source is Brazil, where these beads come from.
Mineral Information - Aluminum borate silicate
Chemical Composition - Al7(O3(BO3)(SiO4)3)
Color - Dark blue to violet blue
Hardness - 7
Specific Gravity - 3.26-3.41
Refractive Index - 1.686-1.723
Dumortierite is said to promote a positive attitude to life and to help you to stay 'young at heart'. It is also said to increase assertiveness and self-confidence encouraging you to speak out when you feel you are being treated unfairly. In addition Dumortierite is said to calm and focus you in traumatic situations giving you the tools to cope with a crisis. Also known as the "Learning Stone" dumortierite promotes mental discipline especially in regard to learning new things. Students find it useful when they are required to take in large amounts of data over short periods of time, because it aids memory.
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