I've got plenty of materials that I can't identify. I still use them just the same. I'm not one to follow patterns or recipes in general, so the name of a material isn't all that important to me. I say use it, and if it doesn't work for your intended purpose, try using it for something else. Is there any reason you want to identify it besides the curiosity of knowing what you have?
ETA: You could try taking a small section into some craft stores and your local fly shop(s) and see if they can identify it for you.
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