Jump to content

Birnessite

From Wikipedia, the free encyclopedia

This is an old revision of this page, as edited by Vsmith (talk | contribs) at 12:28, 14 January 2008 (Undid revision 184240424 by 99tollap (talk)nope). The present address (URL) is a permanent link to this revision, which may differ significantly from the current revision.

Birnessite (Na0.3Ca0.1K0.1Mn4+Mn3+O4·1.5(H2O)) is an mineral oxide of manganese along with calcium, potassium and sodium. It has a dark brown to black color with a submetallic luster. It is also very soft, with a hardness of 1.5. Birnessite is formed by precipitation in lakes, oceans and groundwater and is a major component of desert varnish and deep sea manganese nodules.

It was first described in 1956 and named for an occurrence in Birness, Aberdeenshire, Scotland.

References

Retrieved from "https://en.wikipedia.org/w/index.php?title=Birnessite&oldid=184241478"