Origin: Tip Top mine, Custer Co., South Dakota, United States
Sample size: 8 x 6 x 3 cm with micro (less than 0.5 mm) crude red crystals
Golden brown to brownish red pseudo-octahedral crystals to 1 mm. The blue in
the matrix is probably
triphylite altering
vivianite.
Golden brown to brown, highly lustrous, pseudo-octahedral crystals to about
0.5 mm. On the side of this specimen is a small group of pink
hureaulite crystals.
Origin: Cigana mine, Galileia, Minas Gerais, Brazil
Sample size: 4 x 2.5 x 3 cm (top), 6 x 4 x 2.5 cm (bottom)
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