England
Cornwall
St. Austell
Dorothy china clay pit
Li-mica granite


Rossmanite-Cornwall 
Rossmanite plus elbaite from Cornwall, England.
The darker shades of green are not rossmanite - the specimen 
exhibits considerable zonation into other compositions. Field of view: 4 cm.

Rossmanite occurs in an unusual sample of tourmaline-quartz veinstone that proved to contain a number of different tourmaline species. The tourmalines represent the final crystallization products of a complex magmatic-hydrothermal crystallization-recrystallization sequence that saw foitite form early, followed by schorl, "fluor-schorl", elbaite and rossmanite (Tindle, 2007).

Compositions-Cornwall

X-site compositions of elbaite and rossmanite tourmalines 
from the St. Austell locality span a considerable range 
and grade far into the rossmanite compositional field
(AG Tindle, unpublished analyses, 2007b).

References:

Tindle, A.G. (2008) Minerals of Britain and Ireland. Published by Terra Publishing, Harpenden, Herts AL5 2ZD, England. ISBN-13: 9781903544228

Tindle, A.G. (2007) Personal communication. [a.g.tindle @ open.ac.uk]

last updated 2-Nov-2012