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Dumortierite veins in Quartzite

Dumortierite veins in Quartzite

C022/8094

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Credit

DIRK WIERSMA / SCIENCE PHOTO LIBRARY DIRK WIERSMA / SCIENCE PHOTO LIBRARY

Caption

Dumortierite is a fibrous, variably colored aluminum boro silicate mineral. It crystallizes in the orthorhombic system, and whole crystals typically form fibrous aggregates of slender prismatic crystals. These crystals are vitreous and vary in color from brown, blue, and green to more rare violet and pink. In aluminum rich, metamorphosed rocks and pegmatites it occurs disseminated or in thin veins in schists or quartzites, as in this example. It is used in the manufacture of high grade porcelain. It is sometimes mistaken for sodalite and is known to be used as imitation lapis lazuli. Actual height of specimen is 85 mm.

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