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Chalcopyrite (/ ˌ k æ l k ə ˈ p aɪ ˌ r aɪ t,-k oʊ-/ [7] [8] KAL-kə-PY-ryte, -koh-) is a copper iron sulfide mineral and the most abundant copper ore mineral. It has the chemical formula CuFeS 2 and crystallizes in the tetragonal system.
World bauxite production in 2005 One of the world's largest bauxite mines in Weipa, in northern Queensland, Australia. Australia is the largest producer of bauxite, followed by Guinea and China. [8] Bauxite is usually strip mined because it is almost always found near the surface of the terrain, with little or no overburden.
The D.I.C.E. Award for Immersive Reality Technical Achievement is an award presented annually by the Academy of Interactive Arts & Sciences during the D.I.C.E. Awards.This award "celebrates the highest level of technical achievement within an immersive reality experience through the combined attention to gameplay engineering and visual engineering.
The Bayer process is the principal industrial means of refining bauxite to produce alumina (aluminium oxide) and was developed by Carl Josef Bayer.Bauxite, the most important ore of aluminium, contains only 30–60% aluminium oxide (Al 2 O 3), the rest being a mixture of silica, various iron oxides, and titanium dioxide. [1]
Bauxite forms by the weathering of aluminum-rich and silica-poor rocks in hot, humid, climates, at places with good drainage. Under the proper conditions, weathering disintegrates the aluminium silicate minerals, and dissolves and removes the silica, creating bauxite. The mined US bauxite deposits have all been in the southeastern United States.
Gibbsite is an important ore of aluminium in that it is one of three main phases that make up the rock bauxite. Gibbsite has three named structural polymorphs or polytypes: bayerite (designated often as α-Al(OH) 3, [2]: 2 but sometimes as β-Al(OH) 3) [citation needed], doyleite, and nordstrandite.
This is a list of countries by bauxite production in 2023. There have been some changes from the geographical rankings of 2022. Data
Bauxite on white kaolinitic sandstone at Pera Head, Weipa, Australia Mobilization and precipitation of iron in veins within kaolinized basalt. Hungen, Vogelsberg area, Germany. Bauxite ore is the main source of aluminum. [4]: 65 It is a variety of laterite (residual sedimentary rock), so it has no precise chemical formula. [31]