saps - 8-3-2005 at 14:36
I know very little about Mn3O4. If anybody knows anything about Mn3O4 please inform me.
Thank you
Scratch- - 8-3-2005 at 14:49
You can make it by heating MnO2, and you can probably reduce it with aluminum or magnesium to get manganese.
unionised - 10-3-2005 at 13:50
It's black.
It has a density of 4.856 g/cc.
It's also known as hausmannite
It's the subject of a rather open-ended question in this thread.
What do you want to know?
saps - 10-3-2005 at 14:24
do you know if it can be toxic?
neutrino - 10-3-2005 at 14:55
Judge for yourself: MSDS
Mn2O3 to MnO2
kclo4 - 19-3-2005 at 15:09
How would you go about turning Mn2O3 to MnO2?
12AX7 - 19-3-2005 at 22:07
Well, a strong oxidizer obviously. 
Maybe not -- MnO2 occurs naturally, perhaps
Mn2O3 / 3.4 "rusts" to MnO2 (like iron skipping divalence, rusting to Fe2O3 instead).
Tim
kclo4 - 20-3-2005 at 12:47
Is it possible to make permanganates from Mn2O3?
[Edited on 20-3-2005 by kclo4]
JohnWW - 20-3-2005 at 14:55
Yes, you could, by dissolving it in a strong alkali to give the manganite, MnO2-; then either applying electrolysis, or adding a strong oxidant like
hyochlorite or chlorine gas or plumbate or bismuthate. This would give Na or K permanganate as the final product.
uber luminal - 21-3-2005 at 07:29
iv tried getting MnO2 from KMnO4 with electrolysis(at0.6v). its hard to determine though, since the solution is dark dark purple.(and I couldnt see
anything). I dried the solution in a vacuum oven and found a few bits of black powder in the left over KMnO4. I stopped when the computer showed a
drop in amperage. maybe a result of diminishing ions or something covoring the electrodes.
I found an easier way... the classic glycerin and permanganate. one of the products is your black MnO2. Not the best for getting it pure, but its a
way to get MnO2 if your desperate.