Fig. 29. Orthoclase (light gray), showing sparse plagioclase inclusions in Ba-K growth zones (left side). The orthoclase megacryst lacks plagioclase inclusions to the core outside of the photo (lower left corner). The plagioclase inclusions (white and gray) are zoned with outer sodic rims. Elongate crystal inclusion (dark gray; top, center) in the orthoclase is andalusite. Groundmass minerals are show in upper right. Irregular streams of granular dust (black) over quartz (yellow) and other dust (light gray) on groundmass minerals (black) are granules of grinding powder that did not get removed from the thin section before the cover slip was attached. Sample was collected in the granitic rock near the contact with andalusite-bearing metasedimentary wall rocks.