How does pyrolusite effect the decolorizing of glass containing iron?
"An Elementary Study of Chemistry" by William McPherson
Generally resembles pyrolusite, but is distinguished from it by its superior hardness.
"The Elements of Blowpipe Analysis" by Frederick Hutton Getman
Appended are two analyses of pyrolusite containing sesquioxide of iron.
"British Manufacturing Industries" by L. Arnoux
Manganese dioxide (pyrolusite) 40 parts.
"Electric Bells and All About Them" by S. R. Bottone