Fig. 3. Plagioclase (light gray and white, speckled with tan, sericite alteration) is penetrated along fractures by K-feldspar (black; center and right of center and in lower right in interior of plagioclase). Also K-feldspar (gray) occurs in the interior of plagioclase (white) in lower right corner. Loch Sunart granodiorite, non-porphyritic facies. Strontian pluton.