| (Al,Fe)7(SiO4)3(BO3)O3
This sample of Dumortierite is displayed in the Smithsonian Museum of Natural History. Dumortierite is a silicate with boron , or a borosilicate, with the composition (Al,Fe)7(SiO4)3(BO3)O3 . This sample is about 15x20 cm and is from Dehesa, California.
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