Tags: Chemical Substance, Mineral.

Brammallite is a sodium rich analogue of illite. First described in 1943 for an occurrence in Llandybie Carmarthenshire Wales it was named for British geologist and mineralogist Alfred Brammall (1879–1954).Believed to be a degradation product of paragonite like illite it is a non-expanding clay-sized micaceous mineral. Brammallite is a phyllosilicate or layered silicate.

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