Get the lattice for the structure, e.g., (triclinic,
        orthorhombic, cubic, etc.).This is the same than the
        crystal system with the exception of the hexagonal/rhombohedral
        lattice

        Returns:
            (str): Lattice type for structure or None if type cannot be detected.

def get_lattice_type(self):
        """
        Get the lattice for the structure, e.g., (triclinic,
        orthorhombic, cubic, etc.).This is the same than the
        crystal system with the exception of the hexagonal/rhombohedral
        lattice

        Returns:
            (str): Lattice type for structure or None if type cannot be detected.
        """
        n = self._space_group_data["number"]
        system = self.get_crystal_system()
        if n in [146, 148, 155, 160, 161, 166, 167]:
            return "rhombohedral"
        elif system == "trigonal":
            return "hexagonal"
        else:
            return system