528 Washington — Contributions to Sardinian Petrography: 



Table IV. 



A B 



Si0 2 _ 44-85 44-37 



Al 2 O g 12-55 11*36 



Fe 2 8 3-33 7-23 



FeO ... 5-30 3-49 



MgO 10-27 9-28 



CaO 8-32 8-50 



]STa 2 4-77 3-67 



K,0 0-72 0-74 



H a O+ 2-01 3-28 



H 2 0- 0-95 1-95 



TiO a 5-07 5-21 



P 2 6 , 1*17 0-99 



MnO 0-07 



NiO 0-23 



c 



D 



46-54 



42-30 



12-68 



18-22 



3-41 



17-30 



5*29 



n.d. 



10*09 



6-66 



8-00 



11-01 



5-11 



1-31 



1-64 



2-93 



2-35 



0-55 



0-25 







3-98 



_ _ - - 



0-91 



trace 







trace 



99-60 100-07 100-25 100*28 



A. Analcite basalt (III. (5)6. 2. 5). Scano, Monte Ferru. 

 H. S. Washington analyst, this Journal, xxii, 748, 1914. 



B. Analcite basalt (III. 5. (2)3. (4)5). Monte Columbargiu, 

 Monte Ferru. H. S. Washington analyst, loc. cit. 



C. Analcite basalt (III. 6. 1(2). 4). Bonorva, Sardinia. H. 

 S. Washington analyst, loc. cit. 



D. " Leucite basalt." Scano, Monte Ferru. C. Doelter anal- 

 yst. Denkschr. Akad. Wiss. Wien, xxxix, 80, 1878. 



A1 2 3 , partly due to non-separation of Ti0 2 and P 2 5 and in 

 part probably to the incomplete separation of MgO from 

 A1 2 3 . The iron oxides are almost certainly too high, and the 

 two are not separately determined. It seems probable that his 

 alkalies have been interchanged. 



The norms of these rocks are as follows : 



ABC 



Or 4-45 4-45 15*59 



Ab 28-30 31-44 15-98 



An ' 10-56 11-95 3*61 



Ne _ 6-53 14-62 



Di 1793 15-12 23'79 



Hy 5-00 



01 12-18 7*84 10-21 



Mt _ 2-32 4-87 



II ... 9-73 9-45 7-60 



Hm 1-76 7-23 



Pf 2-18 



Ap 2-69 2-35 2-02 



These place the Scano rock (A) in the subrang with the 

 symbol III. (5) 6. 2. 5, which has been called scanose.* The 



*H. S. Washington, C. E. xii Cong. G. Int., 231, 1914. 



