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Natron
Natron is a naturally occurring mixture of sodium carbonate decahydrate (Na2CO3·10H2O, a kind of soda ash) and about 17% sodium bicarbonate (also called baking soda, NaHCO3) along with small quantities of sodium chloride and sodium sulfate. Natron is white to colourless when pure, varying to gray or yellow with impurities. Natron deposits are sometimes found in saline lake beds which arose in arid environments. Throughout history natron has had many practical applications which continue in the wide range of modern uses of its constituent mineral components.
In modern mineralogy the term ''natron'' has come to mean only the ''sodium carbonate decahydrate'' (hydrated soda ash) which makes up most of the historical salt.
== Etymology ==
The English word ''natron'' is a French cognate derived from the Spanish ''natrón'' through Greek νίτρον ''nitron''. This derives from the Ancient Egyptian word ''nṯry'' 'natron'. ''Natron'' refers to Wadi El Natrun or Natron Valley in Egypt, from which natron was mined by the ancient Egyptians for use in burial rites. The modern chemical symbol for sodium, Na, is an abbreviation of that element's New Latin name ''natrium'', which was derived from ''natron''.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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