Editing Psilomelane (section)

==History and occurrence==
The name, dating back to 1758, makes reference to its characteristic appearance, from the [[Greek language|ancient Greek]] ''ψιλός: psilos'' for (naked, smooth, bald) and ''μέλας: melas'' (black); a [[Latin]]ized form is calvonigrite from ''calvo'' for (bald, smooth) and ''negri'' (black). 

It is a common and important [[ore]] of manganese, occurring under the same conditions and having the same commercial applications as [[pyrolusite]]. It is found at many localities; amongst those which have yielded typical botryoidal specimens may be mentioned the Restormel iron mine at [[Lostwithiel]] in [[Cornwall]], [[Brendon Hills]] in [[Somerset]], [[Hoy, Orkney|Hoy]] in [[Orkney]], Sayn near [[Coblenz]], Hout Bay near [[Cape Town]], and Crimora in Augusta county, Virginia. With pyrolusite it is extensively mined in [[Vermont]], [[Virginia]], [[Arkansas]], and [[Nova Scotia]].