Pale coloured  crystals (5-10 mm in length) from small pockets in a pegmatite from Wolkenburg near Limbach-Oberfrohna, Saxony, Germany,
described in Ertl et al.(2009). Image courtesy of Andreas Ertl.

Composition:

Tourmaline samples of the "fluor-elbaite"-rossmanite solid solution series were chemically (including the light elements) and structurally characterized for the first time. The crystal chemical formulae of the X-site of these three investigated samples range from a "fluor-elbaite" dominant composition with X-site = (Na_0.65□_0.29Ca_0.06) through X-site = (Na_0.54□_0.45Ca_0.01) to Na-rich rossmanite with the composition X-site = (□_0.51Na_0.48Ca_0.01).

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Reference:

Ertl A, Kolitsch U, Meyer HP, Thomas L, Lengauer CL, Nasdala L, Tillmanns E (2009): Substitution mechanism in tourmalines of the "fluor-elbaite"-rossmanite series from Wolkenburg, Saxony, Germany. Neues Jahrbuch fur Mineralogie - Abhandlungen, 186, 51-61.

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last updated  3-March-2011