Fig. 3
From: Some remarks on hydrogen-assisted electrical conductivity in olivine and other minerals
Electrical conductivity of nominally “dry” olivine, wadsleyite, and ringwoodite (from Xu et al. 1998). No water was added, but the FTIR analysis of their samples in my lab showed a substantial amount of water in wadsleyite and ringwoodite. The reported large difference in electrical conductivity is due largely to the difference in water content (Huang et al. 2006)