Jim Penniston's Description of the Craft of Unknown Origin:
AND WHAT CAN YOU SAY ABOUT THE SURFACE THAT YOU TOUCHED?
Well, I think the fabric or the shell was -- I guess the best
description would be a very smooth opaque, like black glass.
Even though at a distance, it appeared metallic. It made no
sense, once I was up there (close to it) that it was more like
black glass. I'm not sure -- I was pretty confused at that point