CM is about right.
Silicon Schottky diodes are a little highver Vf than Ge, leakier than normal silicon junctions, and able to carry large currents with lower internal resistance. They leak less than Ge. They're less temperature sensitive than Ge.
If you want a good envelope detector (including in a compressor) use a precision rectifier circuit. This will get you down to a Vf of a couple of millivolts. If you want quick and cheap, use either Ge, or Schottky. If you don't have either one, use a silicon. Better, try it all these ways and see what you like.
Most good octave circuits (Superfuzz, Blender, Tone Machine, others) use biasing tricks to balance out most of the Vf from the silicon junctions they use.