The experiments concerned the exfoliation of graphite to obtain the single layers of graphene. Today, the "family of van der Waals materials that can be exfoliated to isolate 2D materials keeps growing" . Most materials are synthetic, but nature is providing plenty of van der Waals minerals that can have relevant applications. Therefore, it is fundamental to expand our investigation about Raman spectroscopy to van der Walls graphene-based heterostructures.