That's interesting and beautiful. I think it is curious how the bubbles are so round and not elongated. I don't know lots about tektites, but i thought due to the speed at which they are formed that those bubbles would look a bit different, but what do i know besides it is an awesome looking specimen. Any idea why the color is golden? ht 

Nice score! Congratulations!

Right on  good to see some nuggets, hope you have fun pulling more from your spot. ht

https://www.mcmaster.com/silicone-rubber-rod-stock/food-industry-high-temperature-silicone-rubber-rods/    link is for foodgrade silicone rod stock in a variety of diameters. 3 feet of 3/8" or 1/2" is about $10-$12 . It's not "crimped" so that hurdle will have to be vaulted. Cut up  gum rubber shoe soles from some old Wallabee's would be cheaper, but not food grade

I wish. No, I bought it from a reputable place and it came with a certificate signed by Tom Kapitany who is a  Managing Director of Natural History Museum in Melbourne. https://naturalhistorymuseum.com.au