Surprisingly not. The steam you see is, for the most part, water vapor. I am not a chemist or a volcanologist, but my understanding of the chemistry here is that when acid and alkaline, with the same atomic weight, react they result in water, H2O. It's like taking one H from the acid and one OH from the alkaline to get water. The muddy deposits are minerals brought up by the hot water and steam.
"So I was sitting in my cubicle today, and I realized, ever since I started working, every single day of my life has been worse than the day before it. So that means that every single day that you see me, that's on the worst day of my life."
--Peter Gibbons (Office Space)