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A wonderfully blue partially gemmy heavily etched doubly terminated crystal with a small albite on one end.
Locality: Barra de Salinas, Minas Gerais Brazil
Composition: Being the tourmaline groups composition can vary widely the general chemical formula is X = Ca, Na, K, ▢ = vacancy. Y = Li, Mg, Fe2+, Mn2+, Zn, Al, Cr3+, V3+, Fe3+, Ti4+, vacancy. Z = Mg, Al, Fe3+, Cr3+, V. T = Si, Al, B.