Congratulations!!! You were right!
Plastic is not a mineral.
Plastic is not mineral. It is a solid and it has a definite chemical composition. However its atoms are not arranged in a regular way. Plastic is made from oil (an organic material) and it is made by humans - plastic is not a naturally occurring substance. Plastic is not a mineral.
Having trouble? Go back to the basics to find out what a mineral really is.