Mineralpedia Details for Tavorite
Named for Dr. Elysiario Tavora, a Professor of Mineralogy at the University of Brazil in Rio de Janeiro, Brazil. Tavorite is a secondary mineral that is a result of the oxidation of phosphates in granite pegmatites and occurs in just a few localities including Brazil, Germany, Rwanda, Namibia, Morocco, and Portugal. In the United States, Tavorite can be found in a few states including here in the Black Hills of South Dakota in the Custer Mountain, Hot Shot, Bull Moose, Hesnard, ,and White Elephant mines, among others, with particularly good crystals from the Tip Top mine.
Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/tavorite.pdf
Tavorite from Tip Top mine, Custer Co., South Dakota, United States
Bladed, book-like clusters of Tavorite crystals, 0.5-1cm.