Ammonium carnallite

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A deliquescent, white salt composed of ammonium magnesium chloride. Ammonium carnallite has been found as an efflorescence on three ceramic objects (Wheeler and Wypyski 1993). It is theorized that the salt was formed following a cleaning procedure in which hydrochloric acid was used to remove carbonaceous encrustations followed by an ammonium hydroxide rinse for neutralization.

Synonyms and Related Terms

Ammonium-Karnallit (Deut.)

Composition NH4MgCl3-6H2O
Molecular Weight mol. wt. = 148.70

Additional Information

° G.Wheeler, M.Wypyski, "An Unusual Efflorescence on Greek Ceramics" Studies in Conservation, 38:55-62, 1993.

Sources Checked for Data in Record

  • The Merck Index, Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983 Comment: entry 562