Dumortierite

Dumortierite is an often bright coloured and fibrous mineral occurring in metamorphic rocks rich in aluminium and also in pegmatites and contact metamorphic rocks. It has the formulae Al7(BO3)(SiO4) 3O3 and a relative hardness of 7.
Found on http://www.probertencyclopaedia.com/browse/HD.HTM

Dumortierite

Dumortierite is a fibrous variably colored aluminium boro-silicate mineral, Al7BO3(SiO4)3O3. Dumortierite crystallizes in the orthorhombic system typically forming fibrous aggregates of slender prismatic crystals. The crystals are vitreous and vary in color from brown, blue, and green to more rare violet and pink. Substitution of iron and other tr...
Found on http://en.wikipedia.org/wiki/Dumortierite
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