Pyrolusite: Difference between revisions

'''Pyrolusite''' is a [[mineral]] consisting essentially of [[manganese dioxide]] ([[manganese|Mn]][[oxygen|O]]₂) and is important as an [[ore]] of manganese.<ref name=Ullmann>{{citation | first = Arno H. | last = Reidies | contribution = Manganese Compounds | title = Ullmann's Encyclopedia of Industrial Chemistry | publisher = Wiley-VCH | location = Weinheim | year = 2002 | doi = 10.1002/14356007.a16_123 | volume = 20 | pages = 495–542 | isbn = 978-3-527-30385-54}}.</ref> It is a black, [[amorphous]] appearing mineral, often with a granular, fibrous or columnar structure, sometimes forming [[wiktionary:reniform#Adjective|reniform]] crusts. It has a metallic [[Lustre (mineralogy)|luster]], a black or bluish-black streak, and readily soils the fingers. The [[specific gravity]] is about 4.8. Its name is from the Greek for ''fire'' and to ''wash'', in reference to its use as a way to remove tints from glass.<ref name=Handbook/>