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Joint Photographic Experts Group Image  |  1998-11-13  |  34.3 KB  |  418x446  |  16-bit (5,784 colors)
   ocr: VOLCANIC ROCK CLASSIFICATION Phonolite 12 Tephri- Trachyte phonolite Foidite Phono- Trachy- Trachy- dacite S - - - 9 tephrite andesite - a de Basaltic - Tephrite-A trachy- - - - - - - basanite andesite 6 Trachy- - - - Bill Rhyolite basalt - - Basaltic Dacite Yogi, andesite : 3 Basalt Andesite Picro- Shergotty! Yogi- Dust basalt - Zagami EETA79001B EETA79001A I 35 45 55 65 75 85 SiO2 (weight %)