Dumortierite, Vaca Morta Quarry, Bahia, Brazil

19.6.2019

Dumortierite is an aluminum iron borosilicate mineral that doesn't get much attention in the world of fluorescence, but is a lovely fluorescent species nonetheless. This fist-sized specimen features a thick layer of blue dumortierite on a matrix of white milky quartz, from the Vaca Morta (yes, dead cow) quarry in Serra da Vereda, Boquira, Bahia, Brazil.  This specimen measures 10 x 9 x 5 cm, and weighs 475 grams.

Photo on left shows fluorescence under short wave UV (254nm).  Visible light photo on right.  Click on the above images for a larger view.

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