;i6 



NEW YORK STATE MUSEUM 



Chemical composition and norm of hornblendic augite-laurvikose 





Chem. 



comp. 



Mol. 

 ratio 



Or. 



Ab. 



An. 



Co. 



Hy. 



Mt. 



Qz. 



SiO a 



A1 2 3 .... 

 Fe 2 3 .... 

 FeO 



59 

 19 



1 



4 



3 



5 

 4 





 



70 



52 

 So 

 92 

 78 



•995 



.I 9 T 



.012 



.068 



. OTO 



.263 

 .044 



•514 

 .086 



.123 

 .o6t 



.0004 



.076 





. 019 





.012 

 .012 













•057 



.OTO 





MgO 



CaO 













36 .060 



31! .086 



14' .OAA 







.060 









Na 2 . . r . 





.086 











K 2 



.044 

















H 2 



52 

 OO 



















MnO 



. 001 







.001 













1 















Total . . 



100 .23; 



.044 



.086 



.061 





.076 



, 012 



. 019 



Or.. 



. . 24.40 



Ab. 



. . 44-85 



An. 



.. 17.04 



Co. . 



0.04 



Qz-. 



.. 1. 16 



Mt. . 



• • 2 . 73 



Hy. 



. . 9 . 40 



87.49 



12.13 



Class, = ' ' ■ = 7.21 = 1, persalane 



Fern. 12.13 



Order, ^ = — '- =.013 = 5, canadare 



r 86.33 



K 2 0' + Na 2 0' 1295 , . 



Rang, k-^i = r^ ==2.1 = 2, pulaskase 



613 



Subranj 



CaO' 

 K 2 Q' 

 Na 2 0' 



44 

 86 



51 = 4, laurvikose 



Total 99.62 



The rock is close to the border between classes I and II, and 

 also between subrangs 3 and 4, so that it is near both pulaskose 

 and akerose, more especially the latter. 



The rock of analysis 4 has the following mode 



Units 

 Gr. b> 



Microperthite 1546 x 2 



Plagioclase . 



Quartz 



Augite 



Bronzite . . . 



Hornblende 



Garnet 



Magnetite. . 



Apatite .... 



Titanite. . . . 



Pyrite 



Zircon 



Total 2462 



Also biotite and allanite T . each. 



leasured Sp. Gr. 



b> 



weight 



% 



weight 



1546 X 2 .6 



= 



40 II 



= 



-8.07 



159 X 2 . 63 



= 



417 



= 



6.04 



247 X 2 . 65 



= 



654 



= 



9-47 



143 x 3 -3 



= 



472 



= 



6.83 



63x3. 3 



= 



208 



= 



3.01 



127 X3.2 



= 



406 



= 



6 . 01 



84 x 3 . 7 



= 



3ii 



= 



4-5° 



57 x 5-25 



= 



299 



= 



4-33 



22x3.2 



= 



70 



= 



1 .01 



6x3.5 



= 



21 



=7 



o-33 



6x5.0 



= 



30 



= 



o-43 



2x4.5 



= 



9 



=■ 



0.13 



690^ 



TOO . l6 



