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In geology and mineralogy, a mineral or mineral species is, broadly speaking, a solid chemical compound with a fairly well-defined chemical composition and a specific crystal structure that occurs naturally in pure form. Minerals are classified by key chemical constituents; the two dominant systems are the Dana classification and the Strunz classification. Silicate minerals comprise approximately 90% of the Earth's crust. Other important mineral groups include the native elements, sulfides, oxides, halides, carbonates, sulfates, and phosphates. Ores recovered by mining include metals, coal, oil shale, gemstones, limestone, chalk, dimension stone, rock salt, potash, gravel, and clay. Mining is required to obtain most materials that cannot be grown through agricultural processes, or feasibly created artificially in a laboratory or factory.
A common market was launched on 1 January 2008 with plans to realize a fully integrated single market. It eased the movement of goods and services. However, implementation lagged behind after the 2009 financial crisis. The creation of a customs union began in 2003 and was completed and fully operational on 1 January 2015. In January 2015, the common market was also further integrated, allowing full equality among GCC citizens to work in the government and private sectors, social insurance and retirement coverage, real estate ownership, capital movement, access to education, health and other social services in all member states. However, some barriers remained in the free movement of goods and services. The coordination of taxation systems, accounting standards and civil legislation is currently in progress. The interoperability of professional qualifications, insurance certificates and identity documents is also underway. Gulf Cooperation Council (GCC), political and economic alliance of six Middle Eastern countries—Saudi Arabia, Kuwait, United Arab Emirates, Qatar, Bahrain, and Oman.