To use all functions of this page, please activate cookies in your browser.
With an accout for my.chemeurope.com you can always see everything at a glance – and you can configure your own website and individual newsletter.
- My watch list
- My saved searches
- My saved topics
- My newsletter
Additional recommended knowledge
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. Structurally, brammallite is quite similar to muscovite or sericite with slightly more silicon, magnesium, iron, and water and slightly less tetrahedral aluminium and interlayer potassium.
The chemical formula is given as (Na,H3O)(Al,Mg,Fe)2(Si,Al)4O10[(OH)2,(H2O)].
It occurs as aggregates of small monoclinic dark grey-brown crystals. Due to the small size, positive identification usually requires x-ray diffraction analysis.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Brammallite". A list of authors is available in Wikipedia.|