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Green Island is a small volcanic island in the Pacific Ocean , about 33 km (20.5 miles) off the eastern coast of Taiwan .
Green Island is now a locally popular scuba-diving destination for both locals and expats residing in Taiwan.
The rock on the island is volcanic tholeiite andesite, and volcanic explosive fragments. The volcano erupted from the Pliocene to Pleistocene period. It is part of the Luzon Volcanic Arc. Magma was formed from underthrusting oceanic crust under compression about 25 km deep. The andesite rock contains some visible crystals of pyroxene or amphibole. The geochemistry of the rock shows it is enriched in potassium, strontium and rubidium and light rare earth elements. Chromium and nickel are depleted.
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