In case you forgot or were unaware, MSA has posted several open access publications by the generosity of the authors. Among them:
Guide to Thin Section Microscopy - Michael M. Raith, Peter Raase, and Jurgen Reinhardt. in English, German, or Spanish.
Ore microscopy and ore petrography - 2nd ed. - James R. Craig, David J. Vaughan
Teaching Mineralogy - John B. Brady, David W. Mogk and Dexter Perkins III (editors)
Carbon in Earth - RiMG volume 75 - Robert M. Hazen, Adrian P. Jones, and John A. Baross, Editors
there is also