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|Section2= |Section3= |Section5= |Section6= |Section7= |Section8= }} Magnesium carbonate, MgCO3 (archaic name magnesia alba), is an inorganic salt that is a white solid. Several hydrated and basic forms of magnesium carbonate also exist as minerals. ==Forms== The most common magnesium carbonate forms are the anhydrous salt called ''magnesite'' (MgCO3) and the di, tri, and pentahydrates known as ''barringtonite'' (MgCO3·2 H2O), ''nesquehonite'' (MgCO3·3 H2O), and ''lansfordite'' (MgCO3·5 H2O), respectively.〔 Some basic forms such as ''artinite'' (MgCO3·Mg(OH)2·3 H2O), ''hydromagnesite'' (4 MgCO3·Mg(OH)2·4 H2O), and ''dypingite'' (4 MgCO3· Mg(OH)2·5 H2O) also occur as minerals. Magnesite consists of white trigonal crystals. The anhydrous salt is practically insoluble in water, acetone, and ammonia. All forms of magnesium carbonate react in acids. Magnesium carbonate crystallizes in the calcite structure where in Mg2+ is surrounded by six oxygen atoms. The dihydrate one has a triclinic structure, while the trihydrate has a monoclinic structure. References to 'light' and 'heavy' magnesium carbonates actually refer to the magnesium hydroxy carbonates hydromagnesite and dypingite (respectively). 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「magnesium carbonate」の詳細全文を読む スポンサード リンク
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