(a) Thin section of sample A1*. (b) PPL (Plane Polarized Light) image of a serpentine vein with magnetite grains. (c) Magnified view of a bastite. (d) SEM image of the mesh texture. (e) Magnified image of the mesh texture and (f) associated Fe kα map. (g) Raman spectra of chrysotile and lizardite and (h) Raman map of chrysotile (in red) and lizardite (in green) in mesh. bst: bastite; cal: calcite; chry: chrysotile; liz: lizardite; mgt: magnetite; spt: serpentine.