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Dumortierite: Al6.5-7(BO3)(SiO4)3(O,OH)3
Comments: Divergent fans of acicular purple to lilac colored dumortierite crystals in white andalusite matrix. Location: Dehesa, San Diego Co., California, USA. Scale: Crystal size 2.3cm. © Tom Loomis / Dakota Matrix
Comments: Low-magnification, bright-field image showing dispersed dumortierite fibers extracted from rose quartz on a carbon film. (AmMin 87:270). Location: Madagascar. Scale: See Image. © American Mineralogist
Comments: Blue dumortierite in matrix. Location: Hartmannsdorf, Chemnitz, Saxony, Germany. Scale: Picture size 5 mm. © Thomas Witzke / Abraxas-Verlag