Fig. 4: Oxide van der Waals minerals. | npj 2D Materials and Applications

Fig. 4: Oxide van der Waals minerals.

From: Naturally occurring van der Waals materials

Fig. 4

a, c Three-dimensional representation of the crystal structure of valentinite164 and birnessite165, respectively. b, d Pictures of mineral rocks of valentinite166 and birnessite13, respectively. d Includes a transmission electron microscopy image of an exfoliated bernissite flake. d Reproduced from ref. 13, with permission.

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