THE VOLCANOES AND ROCKS OF PANTELLERIA 711 
anhedra are not common and there is very little olivine. These 
lie in a base of glass which, black under low powers, is seen under 
high to be thickly crowded with brown and black globulites. In’ 
this respect, as well as in the character of the feldspars, it is much 
like the basalts of the submarine eruptions of 1831 and 1801, 
which it also resembles chemically. 
Chemical composition.—Three analyses of these basalts, with 
two of the submarine lavas, and two by Foerstner, are given in the 
table. 
ANALYSES OF BASALT 
(CAMPTONOSE) 
A B | (e D E F G Aa Ba Ca 
SIO Rae th: 46.40| 46.22| 45.72| 44.83] 48.97| 49.87| 49.35| 0.773] 0.770| 0.762 
AUO ya cee TARSA L223) 12 A5 ert. 73) TOe37|| TAssol 1se7n| 14a 120 122 
HeOsa 5. AOL) AYO! Ate Sy) WoAG|) Besa) SoBe Gena = LC yIO| Arey oro 
He@Re es 2. See Zee a7 L2sO0| TL y7o]) 18..50|, (O-.08|) ,OL00 T14\ 107 167 
IMIROS Go bee BOO MOnTAle, Se20\5 5450) 10.221 Onze S70 L75| 2109) 2132 
CAO ee ae- OES5 | POROO! Oe5o| O03) 7-40) ON80|) “Qe Coll .177) 270) ear 
INaZOn es. - 2550) Bose Soo Saal Maca) Bor! Bsox6| ) sey3| FORE SOss 
ISAO yee ean HOO LL3| LOS 40] wa 72h OnOs! er. sr OLr|) .OL2|)) 2onr 
H,0O-+.. ©.14| 0.17; 0.40] 0.81] 0.38] 0.45} 0.49 ae 
H.O—.. OROSIOLOS|| 1OFOn| -OnTol) ‘o.08))) ads). mdi). o-- 
LOG ake 4.54, 5.68] 6.43) 6.88] 3.95| nd n.d.| .057 o7I 080 
TAO one ole « none| ... Po | erat ere Vere eoee | Miarec tice estrone sealer 
121 O Fe einuees Ono5| 1-40) 2-54) 2er4) 9 2-04)) midi! mid: cob) o.0re) JoL0 
SO;. 0.12 Ayes) - see i, ||P sce | Male cece PP Reve eabeereil| ae cet er ane 
Min © 8.5. ON 5 eee ee OFLOl OF 20m OL OO | nedel ss ’m:d:|0-003)|" 2-2) 10.002 
IN OR meer - 0.15 0.08 
Ba@ re ncac: 0.09 Sas 
SrO Ma ..- 0.03 0.03 
100.59] 99.55| 99.82] 99.70|100.34) 99.87] 99-73 
A. Cuddia Ferle. H.S. Washington, analyst. 
B. Monte Sant’ Elmo. H. S. Washington, Q.J.G.S., LXIII (1907), 74. 
C. Dike, Costa Zeneti. H.S. Washington, Q.J.G.S., LXIII (1907), 74- 
D_ Foerstner Volcano (1891). H.S. Washington, Am. Jour. Sci., XX VII (1909), 145. 
E. Graham Island (1831). H.S. Washington, Am. Jour. Sci., X XVII (1909), 138. 
F. San Marco. H. Foerstner, analyst. 7.M.P.M., V (1884), 303. 
G. Cuddie Monti. H. Foerstner, analyst. 7T.M.P.M., V (1884), 393- 
Aa, Ba, Ca. Mol. numbers of A, B, and C, respectively. 
The analyses of the Pantellerian basalts are much alike, and 
except for the rather low silica and high titanium and phosphorus, 
are not specially noteworthy. The only marked difference is in the 
iron oxides. While the sum of both is about the same in all, in 
tH. S. Washington, Am. Jour. Sci., XXVII (1909), 131. 
