Crystal Healing

I bought a quartz crystal skull. A little over an inch in diameter, pretty small. How can I tell if it is real quartz crystal it is made out of? It is pretty heavy; it doesn't feel like how I'd imagine crystal feeling, but it doesn't feel like plastic or acrylic though either. Anything would help. Thank you all.
And it doesn't feel like glass. I have accidentally dropped it and it didn't shatter so it isn't glass. It has few nicks and scratches here and there but nothing huge. It is perfectly round and perfectly cut, each eye is a perfect circle, but the teeth you can tell were actually carved. Can a person really carve this perfectly. The person said they were carved by skilled workers in Peru several centuries ago. But they are so perfectly crafted, which is why I am so suspicious. There are no jagged edges that would be there if the eyes were really carved unless they sanded them down.
I paid $50 for the skull.