Germanium vs. Silicon?

[arbitrary]

I tried out the Keely pedal that used both and let you switch between the two, but that was a long time ago and I plum forgot. So, what are the differences between the Germanium and Silicon chips used in fuzz/distortion/gain pedals?

Thanks!

[bongomania]

We had a thread on that a couple weeks ago:
Germanium?

[arbitrary]

Thanks! This thread is now dead...

I should have searched, I really knew better, but got lazy.