SiO 2 % 
No. 
Volcanic Rocks of 
Name. 
65.24 
2670 
phenocryt 
fieldspar. 
67-54 
2676 
67.49 
3680 
dacite . 
quartz, biotite, hornt 
66.05 
2668 
65-97 
3001 
65.66 
3 OI 7 
dacite .... 
quartz, biotite, horn 
65.60 
2695 
uartz. 
65 - 5 o 
394 
hornblende-mica-andesite 
hornblende, biotite, 
65.11 
2724 
Dclase), quartz. 
64.85 
3008 
64.27 
2736 
hornblende-mica-andesite 
hornblende, biotite, 
61.50 
154 
• • • quartz. 
60.30 
217 
hornblende-pyroxene-andesite 
hornblende, augite, 
5^-49 
2089 
58-05 
2692 
dase, (quartz). 
57 38 
2679 
57-17 
221 
pyroxene-andesite 
augite, hypersthene, 
56.61 
214 
hornblende-pyroxene-andesite 
hornblende-augite-h 
56.28 
2669 
dase, quartz. 
55-92 
694 
hornblende-andesite 
hornblende, plagioc 
55-83 
219 
pyroxene-andesite 
augite, hypersthene, 
