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Fig. 3. Proposed structure for dorite is composed of two sheets of edge-linked tetrahedra, one orderly like mackinawite and the other containing many defects. The two sheets with only light tetrahedra have the mackinawite structure with Fe in all tetrahedral positions and sulfur atoms at the vertices. The other sheets do not have Fe atoms in all the tetrahedral sites with the larger, darker tetrahedra having water molecules filling out the Fe coordination shell.
