32 



HENRY S. WASHINGTON 



table some analyses of closely related rocks from Pantelleria, Sar- 

 dinia, and Catalonia, which have already been published,' and which 

 will be referred to in the subsequent discussion. 



The lavas of Linosa would seem to be quite monotonous in chemical 

 as weU as mineral characters. Mineralogically they are of very 

 simple composition, labradorite, augite, olivine, titaniferous magne- 

 tite, and apatite being the only minerals present in all cases, and 

 usually in about this order of abundance, though in one rare type the 

 amount of oh vine surpasses that of the augite. Chemically, they are 



I. Auvergnose-camptonose (III. 5. 4-3. 4) [feldspar-basalt]. Upper north flow, 

 Monte Ponente, Linosa. Includes CI o . 14, CuO none. 



II. Auvergnose (III. 5. 4. 4, 5) [feldspar-basalt]. Lower north flow, Monte 

 Ponente, Linosa. Includes SO3 0.05, CI 0.42, SrO 0.04, and ZrOa, CuO, and BaO 

 none. 



III. Camptonose (III. 5. 3. 4.) [feldspar-basalt]. Block in tuff, II Fosso, Linosa. 



IV. Camptonose (III. 5. 3. 4) [olivine-basalt]. Monte Raneri, Linosa. Includes 

 trace of Cr2 03. 



V. Camptonose (III. 5. 3. 4) [feldspar-basalt]. Monte San Elmo, Pantelleria. 



VI. Camptonose (III. 5. 3. 4) [feldspar-basalt]. Island of 1891, near Pantelleria. 



VII. Camptonose (III. 5. 3. 4) [feldspar-basalt]. Near CugUeri, Sardinia. 



VIII. Akerose (II. 5. 2. 4) [feldspar-basalt]. Monte San Mateo, near Ploaghe, 

 Sardinia. 



IX. Camptonose (III. 5. 3. 4) [feldspar-basalt]. CastellfuUit, near Olot, Cata- 

 lonia, Spain. 



I H. S. Washington, Quarterly Journal 0} the Geological Society , Vol. LXIII, 

 1907. P- 75- 



