Kari-Kari (caldera)
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Kari-Kari is a Miocene caldera in the Potosi department, Bolivia. It is part of the El Fraile ignimbrite field of the Central Volcanic Zone of the Andes. Volcanic activity in the Central Volcanic Zone
The city of Potosi is located close to or above the Kari-Kari caldera.
Andesite
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Andesite is a volcanic rock of intermediate composition. In a general sense, it is the intermediate type between silica-poor basalt and silica-rich rhyolite. It is fine-grained to porphyritic in textu
A sample of andesite (dark groundmass) with amygdaloidal vesicles filled with zeolite. Diameter of view is 8 cm.
QAPF diagram with basalt/andesite field highlighted in yellow. Andesite is distinguished from basalt by SiO2 > 52%.
Block lava at Fantastic Lava Beds near Cinder Cone in Lassen Volcanic National Park
Photomicrograph of andesite in thin section (between crossed polarizers)