1906.] 



SMITH— PAR AGEiNESIS OF MINERALS. 



235 



V. Lawsonite glaucophane gneiss, three miles southwest of Redwood ; W. 

 O. Clark, analyst. Abundant glaucophane and lawsonite, with a little garnet 

 and white mica. 



VI. Albite crossite gneiss. North Berkeley ; H. Rosenbusch, Sitzungs- 

 berichte d. k. Prciiss. Akad., 1898, p. 712; calculated from the specific gravity 

 of the rock, and the known composition of the two minerals that compose it, 

 albite 75 per cent., and crossite 25 per cent. 



VII. Slightly altered quartz diorite. Oak Ridge, five miles east of Calaveras 

 Valley; W. O. Clark, analyst. Primary quartz, oligoclase, titaniferous horn- 

 blende, secondary crossite, lawsonite and titanite. 



VIII. Soda syenite porphyr}/. Sierra Nevada, No. 1521 SN; Stokes, analyst, 

 H. W. Turner, 17th An. Rept., Pt. I. (1896), p. 727. 



IX. Mica glaucophane schist, Cafe Skarbeli, Syra, Grecian Archipelago ; 

 H. S. Washington, analyst, Amcr. Jour. Sci., IV. Ser., Vol. XI. (1901), p. 39. 

 This analysis shows a mica glaucophane schist of the composition of a diorite, 

 and is introduced here for comparison with those from California. 



X. Pseudodiabase, Sulphur Bank, California, No. 36, Sulphur Bank ; Mel- 

 ville, analyst ; G. F. Becker, Mon. XIII., U. S. Geol. Survey, p. 99. The 

 rock analysed showed no glaucophane, but Becker mentions that mineral as 

 being not uncommon in similar pseudodiabases, which were thought to be 



altered sedimentary rocks. 



Table of Analyses. »^ 



XL Pseudodiorite, Knoxville, California No. 56, Knoxville; Melville, 

 analyst; G. F. Becker, Mon. XIII., U. S. Geol. Survey, p. loi. This rock 

 is a greenstone, composed almost entirely of actinolite, white mica, with rutile, 

 zircon, and titanite. Becker does not mention glaucophane as occurring in 

 this particular rock. 



XII. Glaucophane schist. Sulphur Bank, No. 98 Sulphur Bank; Melville, 

 analyst; G. F. Becker, Mon. XIII., U. S. Geol. Survey, p. 104. A basic glauco- 

 phane schist, with glaucophane, white mica, zoisite? (pale epidote?), albite, 

 a little quartz, and titanite. 



