THE VOLCANOES AND ROCKS OF PANTELLERIA 699 
GAUDI s. 5k Soe ee Rr ae a 30 
SOG ae MMCEOCMIME:,2,/len tena ery iin ala ela. ye 51 
CORES /TAIGS.. 5 RRR tor aE a Sea 
PNCPUUCC AMI PIUC 2 «namical fe haba wns ws Ose Vee eet - a 
T00 
Though the type very closely resembles the pantellerites, yet 
it seems advisable to follow the suggestion of Rosenbusch and call 
these rocks comendites, partly because of the very high silica, 
partly because of the high potash, and partly because of the mega- 
scopic characters and the microscopic texture of the ground- 
mass. 
AEGIRITE PANTELLERITE, SANTELMO TYPE (SANTELMAL GRORUDOSE) 
Occurrence.—Lavas of this type (the “crystalline pantellerite”’ 
of Foerstner) are abundant on the island. In the north it forms 
flows from Monte Sant’ Elmo, an area to the south of Monte 
Gelkhamar, and a somewhat more extensive one from near Cuddia 
Bonsulton northeasterly to Costa Zeneti and Cuddia Nera (form- 
ing the upper part of these), Rione Khadingia, and beyond to the 
coast near Punte Pozzolana and Karuscia. In the south and 
southeast it constitutes the mass of Cuddia Attalora and the 
slopes from Cuddie dietro Isola and Serra Ghirlanda to the sea. 
As noted above the flows of this pantellerite were the last from 
the early volcano, before the great caldera-forming eruption. 
These lavas are often accompanied by yellow tuffs. Flows of 
this type are generally pahoehoe, and in places the lava is made up 
of mingled streaks of this and the succeeding type. 
Megascopic characters —These lavas are often platy, generally 
compact, but again somewhat vesicular. The type is distinctly 
but finely porphyritic. The aphanitic, dull, and apparently 
‘cryptocrystalline groundmass is of a light yellowish-green color, 
which varies somewhat in different specimens. Through this are 
sprinkled many small (1-3 mm.), glistening, white feldspar pheno- 
crysts, and few smaller stout prisms of black pyroxene and horn- 
blende. Some of these are also to be seen in the crevices and 
vesicles, with occasional small tables of tridymite. 
