![]() Joseph Priestley noticed that when this salt reacted with lime, a vapor was released, which he termed as Ammonia. This white crystalline salt was called "salt of Ammon" ( sal ammoniac). Roman visitors to oracle temple of Amun in Siwa oasis collected a white crystalline material from the ceiling and walls caused by various pollutants. In any case, that salt ultimately gave ammonia and ammonium compounds their name. According to Herbert Hoover's commentary in his English translation of Georgius Agricola's De re metallica, it is likely to have been common sea salt. However, the description Pliny gives of the salt does not conform to the properties of ammonium chloride. Pliny, in Book XXXI of his Natural History, refers to a salt produced in the Roman province of Cyrenaica named hammoniacum, so called because of its proximity to the nearby Temple of Jupiter Amun ( Greek Ἄμμων Ammon).
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