Fig. 2. This photo shows a cathodoluminescent image of textures in deformed diorite in transition towards the myrmekite-bearing granite. Two plagioclase crystals show remnant zoning. Cores are now less calcic than in Fig. 1 (greenish-yellow color is now gone). Under cross-polarized light the crystal has mottled extinction, lacks strong zoning, shows no apparent fractures, and exhibits no K-feldspar islands. Under cathodoluminescence, however, fractures are visible, cutting the calcic cores, and along these fractures calcium has been removed (dark veins). Locally, K-feldspar islands (blue) occur where loss of calcium is most advanced. For the plagioclase crystals with uniform beige color, electron-microprobe studies show that both cores and rims have compositions of An_17-20. In these crystals electron-microprobe studies also show that Ca has been lost because some Si is in excess of what would normally fit into a balanced feldspar structure relative to the residual Na, Ca, and Al. Note that crystal in upper left has a relatively calcic rim (beige) and more sodic core (purplish) and is in transition to what occurs in Fig. 3.