5IO 



FREDERIC H. LAHEE 



Fig. 13. — Garnet crystal in schist. 

 (See Fig. 14.) 15 diameters. 



Fig. 14. — Outline sketch of Fig. 13. 

 C, chlorite. A and B, the poles of 

 minimum compression. The quartz 

 "tails" extend out from the garnet 

 (G) from these poles in opposite direc- 

 tions. The curves of the schistosity in- 

 dicate rotation of the garnet (arrows) . 



Fig. 15. — Metacrysts of biotite in a 

 rock having no flow cleavage. The 

 irregular outlines of the metacrysts 

 are determined by the adjacent quartz 

 grains. The biotite has neither dimen- 

 sional nor crystallographic orienta- 

 tion. 12 diameters. 



Fig. 16. — Photomicrograph of a rock 

 with a well-developed flow cleavage. 

 The biotite plates (dark) have dimen- 

 sional paraUelism and many of them 

 have crystallographic parallelism. 10 

 diameters. 



