Agrellite is a rare mineral which occurs as needle-like crystals.
They are whitish, somewhat translucent,
An agrellite crystal in normal white light (left) and in UV light (right). The crystal is 16 mm long. and have a blank, shimmering surface. In ultraviolet light, the crystals shine pink. The mineral can be found at the Kipawa River in Québec, Canada; in Marathon County, Wisconsin, U.S.A.; and with some luck at well-assorted mineral fairs. Its chemical composition is NaCa2Si4O10F.
The mineral was named in honor of Stuart Agrell, who was a geologist at the University of Cambridge. His grandfather was Frans Wilhelm Agrell.
Literature (most of it not studied by us)
- J. Gittins, M. G. Bown, and B. D. Sturman, “Agrellite, a new rock-forming mineral in regionally metamorphosed agpaitic alkalic rocks”, Canadian Mineralogist, vol. 14, pp. 120–126, 1976.
- M. Fleischer and J. A. Mandarino, “New mineral names”, American Mineralogist, vol. 62, p. 173, 1977.
- L. G. Medaris and S. Guggenheim, “An occurrence of agrellite and miserite in the Wausau complex, Marathon County, Wisconsin”, in Mineralogical Society of America Symposium on Alkaline Complexes, Wausau, Wisconsin, 1983.
- Roberts, Campbell, and Rapp, “Agrellite”, in Encyclopedia of Minerals.
- Fleischer, “Agrellite”, in Glossary of Mineral Species.