Watermelon tourmaline is a variety of concentrically color-zoned ...

... tourmaline with red interiors and green exteriors and is distinct from longitudinal bi-color or polychrome zonation. The named was coined by George Robeley Howe (1860-1950) of Norway, ...

source: [ https://www.mindat.org/min-10889.html ]


Bicolor Tourmaline

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