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Franklinfurnaceite: Ca2(Fe+++,Al)Mn+++Mn++3Zn2Si2O10(OH)8
Comments: Brown resinous mass of franklinfurnaceite, in black franklinite, with white calcite. Location: Franklin Mine, Franklin, Sussex Co., New Jersey, USA. Scale: Picture Size 6 mm. © Jeff Weissman / Photographic Guide to Mineral Species