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Home > Museums and Research Centers > Karst and Cave Studies > FMD

Ferromanganese Deposits

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  • Rods embedded in corroded crystal by M. Spilde, D. Northup, P. Boston, and L. Mallory

    Rods embedded in corroded crystal

  • Rod shaped formations on clay by M. Spilde and D. Northup

    Rod shaped formations on clay

  • Rod shaped mineral and debris on artificial substrate by M. Spilde

    Rod shaped mineral and debris on artificial substrate

  • Rosette and star shapes on calcite by M. Spilde and D. Northup

    Rosette and star shapes on calcite

  • Rosette of tablets in FMD by M. Spilde

    Rosette of tablets in FMD

  • Segmented filaments and spheroids on tissue-paper by A. Dichosa

    Segmented filaments and spheroids on tissue-paper

  • Segmented filaments bridging tissue-paper by A. Dichosa

    Segmented filaments bridging tissue-paper

  • Segmented hairy filament and beads on a string on corroded crystal by M. Spilde, D. Northup, P. Boston, and L. Mallory

    Segmented hairy filament and beads on a string on corroded crystal

  • Septated filaments on calcite and over debris by M. Spilde and D. Northup

    Septated filaments on calcite and over debris

  • Several filaments bridging tissue-paper by A. Dichosa

    Several filaments bridging tissue-paper

  • Skeletal iron oxide by M. Spilde

    Skeletal iron oxide

  • Small crystals on larger crystals by A. Dichosa

    Small crystals on larger crystals

  • Spheroids and tissue-paper mineral on artificial substrate by M. Spilde

    Spheroids and tissue-paper mineral on artificial substrate

  • Spheroids connected by filaments by M. Spilde and A. Dichosa

    Spheroids connected by filaments

  • Spheroids connected by filaments by M. Spilde and A. Dichosa

    Spheroids connected by filaments

  • Spheroids in pit in calcite by M. Spilde and D. Northup

    Spheroids in pit in calcite

  • Spheroids in subhedral calcite crystals by M. Spilde and D. Northup

    Spheroids in subhedral calcite crystals

  • Spheroids on felted filaments by A. Dichosa

    Spheroids on felted filaments

  • Spheroids on tissue-paper by A. Dichosa

    Spheroids on tissue-paper

  • Spheroids with thread in platy mineral by M. Spilde and A. Dichosa

    Spheroids with thread in platy mineral

  • Spiral calcite pit with star shaped minerals by M. Spilde and D. Northup

    Spiral calcite pit with star shaped minerals

  • Stacked iron oxide star shapes in subhedral crystals by M. Spilde

    Stacked iron oxide star shapes in subhedral crystals

  • Stacked star shaped manganese oxide by M. Spilde and P. Boston

    Stacked star shaped manganese oxide

  • Star and tablet shaped minerals in calcite pit by M. Spilde and D. Northup

    Star and tablet shaped minerals in calcite pit

  • Stars and other shapes on calcite by M. Spilde and D. Northup

    Stars and other shapes on calcite

  • Star-shaped crystals in pit in calcite by M. Spilde and D. Northup

    Star-shaped crystals in pit in calcite

  • Star shaped iron lace on manganese oxide crystal by M. Spilde

    Star shaped iron lace on manganese oxide crystal

  • Star shaped mineral and spheroids on calcite crystal by M. Spilde and D. Northup

    Star shaped mineral and spheroids on calcite crystal

  • Star shaped mineral on calcite by M. Spilde and D. Northup

    Star shaped mineral on calcite

  • Star shaped mineral on calcite crystal by M. Spilde and D. Northup

    Star shaped mineral on calcite crystal

  • Star shaped minerals in calcite pit by M. Spilde and D. Northup

    Star shaped minerals in calcite pit

  • Star shaped minerals in pit on dolomite by M. Spilde and D. Northup

    Star shaped minerals in pit on dolomite

  • Star shaped minerals on corrosion residue by M. Spilde

    Star shaped minerals on corrosion residue

  • Star shapes and attachment ring on corroded crystal by M. Spilde, D. Northup, P. Boston, and L. Mallory

    Star shapes and attachment ring on corroded crystal

  • Star shapes from FMD by M. Spilde and D. Northup

    Star shapes from FMD

  • Star shapes on dendrite by M. Spilde and P. Boston

    Star shapes on dendrite

  • Star shapes on platy clay by M. Spilde and D. Northup

    Star shapes on platy clay

  • Star shapes on play crystals with filaments by M. Spilde and P. Boston

    Star shapes on play crystals with filaments

  • Star shapes on quartz crystal with hillocks by M. Spilde and D. Northup

    Star shapes on quartz crystal with hillocks

  • Star shapes on tabular and platy crystals by M. Spilde

    Star shapes on tabular and platy crystals

  • Star shapes with a filament on platy crystal by M. Spilde and P. Boston

    Star shapes with a filament on platy crystal

  • Striated calcite crystal with debris by M. Spilde and D. Northup

    Striated calcite crystal with debris

  • Striated calcite with manganese coating by M. Spilde and D. Northup

    Striated calcite with manganese coating

  • Subhedral manganese oxide crystals by M. Spilde and D. Northup

    Subhedral manganese oxide crystals

  • Svanbergite cubes in FMD by D. Northup and M. Spilde

    Svanbergite cubes in FMD

  • Svanbergite cubes in tissue-paper mineral by D. Northup and M. Spilde

    Svanbergite cubes in tissue-paper mineral

  • Svanbergite cubes on iron oxide debris on calcite crystal by M. Spilde and D. Northup

    Svanbergite cubes on iron oxide debris on calcite crystal

  • Svanbergite cubic crystals by M. Spilde and D. Northup

    Svanbergite cubic crystals

  • Svanbergite cuboid crystals by M. Spilde and D. Northup

    Svanbergite cuboid crystals

  • Svanbergite cuboid crystals on quartz by M. Spilde and D. Northup

    Svanbergite cuboid crystals on quartz

  • Tabular Al-Si clay crystals by M. Spilde and D. Northup

    Tabular Al-Si clay crystals

  • Tabular crystals on calcite by M. Spilde and D. Northup

    Tabular crystals on calcite

  • Tabular crystals with corroded crystals by A. Dichosa

    Tabular crystals with corroded crystals

  • Tabular euhedral clay crystals and star shapes by M. Spilde and P. Boston

    Tabular euhedral clay crystals and star shapes

  • Tangle of filaments by M. Spilde and D. Northup

    Tangle of filaments

  • Tangle of segmented filaments by A. Dichosa

    Tangle of segmented filaments

  • Textured clay surface by M. Spilde and D. Northup

    Textured clay surface

  • Threads and filaments bridging ferro-manganese deposits by D. Northup and M. Spilde

    Threads and filaments bridging ferro-manganese deposits

  • Tissue-paper manganese oxide by M. Spilde and D. Northup

    Tissue-paper manganese oxide

  • Tissue-paper manganese oxide mineral by M. Spilde

    Tissue-paper manganese oxide mineral

  • Tissue-paper mineral and spheroids on artificial substrate by M. Spilde

    Tissue-paper mineral and spheroids on artificial substrate

  • Tissue-paper mineral on artificial substrate by M. Spilde

    Tissue-paper mineral on artificial substrate

  • Tissue-paper mineral with beads on a string by M. Spilde and D. Northup

    Tissue-paper mineral with beads on a string

  • Twisted beads on a string on calcite by M. Spilde and D. Northup

    Twisted beads on a string on calcite

  • Unusual calcite crystals by M. Spilde and D. Northup

    Unusual calcite crystals

  • Various spheroids bridged by threads by M. Spilde and A. Dichosa

    Various spheroids bridged by threads

  • View of beads on a string bridging tissue-paper mineral by D. Northup and M. Spilde

    View of beads on a string bridging tissue-paper mineral

  • View of corroded calcite by M. Spilde

    View of corroded calcite

  • View of ferro-manganese deposits by D. Northup and M. Spilde

    View of ferro-manganese deposits

  • View of filaments bridging FMD with star shaped minerals by D. Northup and M. Spilde

    View of filaments bridging FMD with star shaped minerals

  • View of filaments on plate edge by M. Spilde and D. Northup

    View of filaments on plate edge

  • View of growth on artificial substrate by M. Spilde

    View of growth on artificial substrate

  • View of spheroids and felted filaments by A. Dichosa

    View of spheroids and felted filaments

  • View of star shapes and beads on a string by D. Northup and M. Spilde

    View of star shapes and beads on a string

  • View of star shapes on manganese oxide sheets by M. Spilde

    View of star shapes on manganese oxide sheets

  • View of tissue-paper and filaments by A. Dichosa

    View of tissue-paper and filaments

 
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