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Fig. 1

From: The effect of anisotropic electrical conductivity of amphiboles on geophysical anomalies observed in subduction zones

Fig. 1

The extremely anisotropic structure of riebeckite. (a) View along the c axis of the amphibole structure, which consists of I-beams held together by cations at the M(4) site. The I-beam consists of conductive ribbons of edge-sharing FeO6 octahedra sandwiched between two insulating silicate ribbons, forming a natural nanorod ( ∼1 × 2 nm2 cross section) along c. (b) A sketch of electronic-polaron hopping (black arrows) along ribbons of FeO6 octahedra, resulting in strongly anisotropic conductivity. Atomic structure plotted with Vesta 3.5.8 (https://jp-minerals.org/vesta/en/)65.

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