Brazilianite on Matrix | yellow crystal, mineral specimen from BrazilBrazilianite is a striking phosphate mineral best known for its rich, golden yellow to greenish yellow hues and its remarkable transparency and brilliance when well formed. First described from the Brazilian pegmatites of Minas Gerais, this sodium aluminum phosphate hydroxide (NaAl(PO)(OH)) typically occurs as prismatic or tabular crystals with a monoclinic structure, often exhibiting excellent terminations and a vitreous to slightly pearly luster.