Abstract

Ammonioborite, a new mineral, is a hydrous borate of ammonium, from Lar-derello, Italy. In chemical composition it is identical or very similar to the known borate, larderellite, but its optical properties are different. The exact formula of both minerals is uncertain; they seem to represent dimorphous forms of (NH4)2O·5B2O3·5H2O.

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