Switzer, George Department of Mineral Sciences, National Museum of Natural History, Smithsonian Institution, Washington, DC.
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These minerals are few in number and with the exception of soda niter are of rare occurrence. Normal anhydrous and hydrated nitrates occurring as minerals are soda niter, NaNO3; niter, KNO3; ammonia niter, NH4NO3; nitrobarite, Ba(NO3)2; nitrocalcite, Ca(NO3)2·4H2O; and nitromagnesite, Mg(NO3)2·6H2O. In addition there are three known naturally occurring nitrates containing hydroxyl or halogen, or compound nitrates. They are gerhardtite, Cu2(NO3)(OH)3; buttgenbachite, Cu19(NO3)2Cl4(OH)32·3H2O; and darapskite, Na3(NO3)(SO4)·H2O. See also: Niter; Soda niter
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