Rossmanite occurs in selected pink and green regions in color zoned crystals from the Democratic Republic of the Congo. The crystals range from liddicoatite to elbaite and to rossmanite. In all rossmanite analyses published, the tourmaline just barely crosses the compositional line into the rossmanite compositional field.
Composition:
References:
Simmons W., Falster A. (2004) Gem Tourmaline from Congo. Gems & Gemology 40, 263-265.
Laurs BM, Simmons W, Falster A (2004) Gem News International: Gem Tourmaline from Congo. Gems & Gemology, data repository for tourmaline slices.
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Laurs BM, Simmons W, Falster A (2004) Gem News International: Gem Tourmaline from Congo. Gems & Gemology, data repository for tourmaline crystals.
Broken Link