Thanks bagginsbill. The Turbulence node works well as an easily adjustable Bump, and gives the Glossy specular reflection the ragged edges I was looking for. I really appreciate your help.

Also, thanks pjz99. I changed my Units to Inches and entered the values bagginsbill showed, and then watched as I changed Units back and forth among Feet, Centimeters, etc. Funny, the Bump Value changed accordingly, but the values in the Glossy and Turbulence nodes were unaffected by changing Units. So you're right, we have to be careful when we're sharing Material Room settings, since Units affects some values there.

Rick