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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.

The Middle East and North Africa. It is also known as WANA, which alternatively refers to the Middle East as Western Asia. As a regional identifier, MENA is often used in academia, military planning, disaster relief, media planning and business writing. Moreover, the region shares a number of cultural, economic, and environmental similarities across its comprising countries; for example, some of the most extreme impacts of climate change will be felt in MENA. Some terms have a wider definition than MENA, such as MENAP or Greater Middle East, which extends to South Asia to include the countries of Afghanistan and Pakistan. The term MENAT explicitly includes Turkey, which is usually excluded from some MENA definitions, even though Turkey is almost always considered part of the Middle East. Countries in mena are Algeria, Bahrain, Egypt, Israel, Jordan, Kuwait, Libya, Morocco, Oman, Qatar, Saudi Arabia, Tunisia, United Arab Emirates, Yemen.