Aguada, Puerto Rico Sea Glass ID?
by Leo Martinez
(Hatillo, Puerto Rico)
Is it glass or is it ...???
~ sea glass photo submitted by Leo Martinez, Hatillo, Puerto Rico

Natural or man-made?
I found this in Aguada, Puerto Rico, in the Caribbean - July 2017
I don't know if it's natural or man made.
This looks like glass but not exactly.
It has a swirl pattern and an orange smudge. Any clues??
~ sea glass photo submitted by Leo Martinez, Hatillo, Puerto Rico 
Scroll down for comments...