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WikiPedia: Orthoclas http://www.webmineral.com/data/Orthoclase.shtml http://rruff.geo.arizona.edu/doclib/hom/orthoclase... http://www.gemsociety.org/article/moonstone-jewelr... http://www.mindat.org/min-28.html http://www.mindat.org/min-3026.html http://www.minsocam.org/ammin/AM66/AM66_885.pdf http://vea.gov.vn/vn/tintuc/tinnoibo/Pages/Th%C3%B... https://commons.wikimedia.org/wiki/Category:Orthoc...