Đá_vỏ_chai
Đá_vỏ_chai
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WikiPedia: Đá_vỏ_chai http://books.google.com.au/books?id=HlwUo0IccoMC&p... http://www.em.gov.bc.ca/mining/GeolSurv/MetallicMi... http://www.scielo.cl/scielo.php?pid=S0716-02082004... http://www.scielo.cl/scielo.php?pid=S0716-02082005... http://www.encyclopedia.com/doc/1O27-obsidian.html http://www.finescience.com/commerce/ccc1065-obsidi... http://mineral.galleries.com/minerals/mineralo/obs... http://www.nytimes.com/2010/04/06/science/06archeo... http://www.obsidianlab.com/image_maps/image_maps.h... http://www.sourcecatalog.com/or/s_or.html