338 



University of California. 



[Vol. 2. 



TABLE No. III. 



Analyses of Blue Hornblendes. 



Si 2 



Al 2 3 



Fe 2 O, 



Fe O 



Mg O 



Ca O 



Na 2 O 



K 2 O 



H 2 O at ioo° 



H 2 above ioo° 



Ti 2 



Mn O 



54-52 

 9-25 

 4-44 

 9.81 



10.33 

 1.98 



7-56 

 .16 



1.78 



•39 

 .46 



100.68 



52.39 

 11.29 



3-74 

 9-13 



H-37 

 3-03 

 6.14 



trace 



2-57 

 .14 

 1 race 



99.80 



57-67 

 11.07 

 3.20 

 9.68 

 9-85 

 •95 

 6.80 

 •42 



• 12 

 •36 



.< 6 



100. 18 



55-64 

 15. 11 

 3.08 

 6.85 

 7.80 

 2.40 

 9-34 



•56 



100.78 



56.49 

 12.23 



10.91 



7-97 

 2.25 

 9.28 



•50 



99-63 



57-8i 

 12.03 

 2.17 

 5-78 

 13-07 

 2.20 



7-33 



100.39 



55-02 



4-75 

 1091 

 9.46 

 9-30 

 2.38 

 7.62 

 .27 

 undet 



trace 



99.70 



55-o6 

 •49 

 15.48 

 7.40 

 11.49 

 .98 

 6.38 



100.06 



1. Blue hornblende from rock, San Pablo, California. 



2. Blue hornblende from boulder, San Pablo, California. 



3. Glaucophane from Syra, Washington, Am. Journ. of Science [4], 40, 



vol. ii, p. 40. 



4. Glaucophane from Syra, Luedecke, Zeit. d. Deut. Geol. Gesellsch, 



Band 28, S. 252. 



5. Glaucophane from Syra, Schnedermann, Journ. fur Prakt. Chemie, Band 



34. S. 238. 



6. Glaucophane from Zermatt, Bodewig, Pogg. Annalen., Band 158, S. 228. 



7. Crossite from Berkeley, this Bulletin, vol. 1, p. 188. 



8. Glaucophane from Syra (Rhodus), Toullon, Sitzb. Akad. Wein., Band 



100, S. 172. 



TABLE No. IV. 



Calculations Leading to the Formula of the Blue Hornblende . 



Analysis 1. 



Elementary 

 Gout position. 



Atomic 

 (juotient. 



Atomic 

 Ratio. 



Analysis 2. 



Elementary 

 Composition. 



Atomic 

 (juotient. 



Atomic 

 Ratio. 



Si 2 54-52 



Si 25.64 



.9098 



25- 



Si 2 52.39 



Si 24.63 



.8740 



25- 



A1 2 3 9.25 



Al 4.91 



.1824 



5-oi 



A1,0 3 11.29 



Al 5-99 



.2225 



6.36 



Fe 2 O a 4.44 



Fe 3 11 



•0559 



■'5 



Fe 2 3 3.74 



Fe 2.62 



.0471 



i-35 



FeO 9.81 



Fe 7.63 



■1372 



3-76 



Fe O 9. 1 3 



Fe 7.10 



.1276 



3.65 



MgO 10.33 



Mg 6.23 



.2585 



7.10 



Mg O11.37 



Mg 6.85 



.2842 



8.13 



Ca O 1.98 



Ca 1.4 1 



•0354 



•97 



Ca O 3.03 



Ca 2.16 



•0543 



i-55 



Na 2 7-56 



Na 5.61 



.2452 



6-73 



Na, O 6.14 



Na 4.56 



•1993 



5- 70 



K 2 .16 



K .13 



•0033 



.09 



K 2 O trace 















H 2 1.78 



H .20 



.2000 



5-49 



H 2 2.57 



H .29 



.2900 



8.29 



Ti 2 .39 



Ti .24 



.0050 



.14 



Ti 2 . 14 



Ti .08 



.0017 



•05 



Mn O .46 



Mn .36 

 O 44-53 



.0066 



.18 



Mn O trace 









2.8042 



77.00 



O 45-72 



2.879 



80.73 







