An aluminum boro-silicate, typically blue, violet-blue, or brownish, often found as fibrous inclusions in quartz. It's a stone of patience, order, and intellectual ability, enhancing self-discipline and learning capacity.
Blue, Violet-Blue, Brown, Greenish-Blue
Dumortierite is classified as a nesosilicate mineral which typically crystallizes in the orthorhombic system. Its chemical formula is Al7BO3(SiO4)3O3 or Al6.5-7BO3(SiO4)3(O,OH)3[1]. Common crystal habits include as fibrous or columnar crystals; coarsely crystalline to intimate parallel aggregates of needles; massive.