Minerals of the Chickering Mine Walpole, NH        METAVIVIANITE   Fe2+3-xFe3+x(PO4)2(OH)x·(8-x)H2O
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Specimen owner ID's (capitals): TM = Tom Mortimer, BW = Bob Wilken, BJ = Bob Janules, PC = Peter Cristofono, AW = Anna Wilken
Photographer ID's (lower case).
Identification: Visual
Discussion: Metavivianite, a dimorph of vivianite, manifests three habits at the Chickering Mine: 1. Opaque, waxy, leek green, platy crystals with a lanceolate termination. 2. Waxy, mottled, yellow-green, blocky crystals showing parallel striations along the c axis. 3. Yellowish-green, submetallic, scaly, prismatic crystals that often have a vivianite core.
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METAVIVIANITE      1.6 mm field of view      BW     Photo: MTV_1   [bw]
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METAVIVIANITE      3 mm crystal     BW     Photo: MTV_2   [bw]
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METAVIVIANITE      3.8 mm field of view     BW     Photo: MTV_3   [bw]
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METAVIVIANITE      1 mm field of view     TM     Photo: Metavivianite1   [tm]