This page provides mineralogical data about Magnesium Orthite.
References for Magnesium Orthite
Reference List:
Peacor, D.R. and Dunn, P.J. (1988) Dollaseite-(Ce)(magnesium orthite redefined): structure refinement and implications for F + M 2+ substitution in epidote-group minerals. American Mineralogist: 73: 838-842.