Image courtesy of Seiichiro Uehara, Kyushu University.
Rossmanite occurs in a complex Li-Cs-Ta enriched pegmatite near the city of Nagatare, Japan. The compositions are mostly in the elbaite field and just barely cross over into the rossmanite field.
A typical rossmanite composition is
X(0.52Na0.47Ca0.01) Y(Li1.20Al1.72Mn0.07Fe0.01Zn0.02) ZAl6.00 (BO3.00)3.00 Si6.00O18.00 [(OH)3.88F0.12]
Shirose Y, Uehara S (2013) Li tourmaline from Nagatare, Fukuoka Prefecture, Japan. Journal of Mineralogical and Petrological Sciences, 108, 238-243.
last upgraded: 14-Aug-2014