How can you tell if a crystal skull is real?

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.

Most of those are machine made, in Germany, and are glass or clear quartz.

.The crystal skulls are a number of human skull hardstone carvings made from clear or milky quartz rock, known in art history as “rock crystal”, claimed to be pre-Columbian Mesoamerican artifacts by their alleged finders. However, none of the specimens made available for scientific study have been authenticated as pre-Columbian in origin. The results of these studies demonstrated that those examined were manufactured in the mid-19th century or later, almost certainly in Europe.[1] Despite some claims presented in an assortment of popularizing literature, legends of crystal skulls with mystical powers do not figure in genuine Mesoamerican or other Native American mythologies and spiritual accounts.[2]

Quartz Crystal Skull

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