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ferro-glaucophane
Iron-rich variant of Glaucophane, which has iron dominating over the magnesium in a solid solution series. Ferro-Glaucophane is recognized by the IMA as a distinct mineral species with the following chemical formula: Na 2Mg 3Al 2Si 8O 22(OH) 2. There can be iron replacing some of the magnesium up to 50 percent.
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