Tetrahedral crystal of Helvine, aka Helvite. Two toned in color with light yellow/green overlaying very dark, almost black. Aesthetically with white Albite. A rare beryllium mineral: Mn4Be3(SiO4)3S
Dimensions (millimeters): 40 x 30 x 25
Dimensions (inches): 1.6 x 1.2 x 1
Origins: Navegadora Mine, Conselheiro Pena, Minhas Gerais, Brazil
All Mineral Specimens come with a label with the name of the mineral and where it was mined
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