Optical Spectra of Osumilite-(Mg),
KMg
2
Al
3
(Al
2
Si
10
)O
30
Taran MN, Rossman GR (2001) Optical spectroscopic study of tuhualite and a re-examination of the beryl, cordierite, and osumilite spectra. American Mineralogist 86, 973-980.