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Barite mass (Vanport Flint, Middle Pennsylvanian; Nethers Flint Quarries, Flint Ridge, Ohio, USA) 9.jpg - Ser Amantio di Nicolao

Barite mass (Vanport Flint, Middle Pennsylvanian; Nethers Flint Quarries, Flint Ridge, Ohio, USA) 8.jpg - Ser Amantio di Nicolao

Barite mass (Vanport Flint, Middle Pennsylvanian; Nethers Flint Quarries, Flint Ridge, Ohio, USA) 6.jpg - Ser Amantio di Nicolao

Barite mass (Vanport Flint, Middle Pennsylvanian; Nethers Flint Quarries, Flint Ridge, Ohio, USA) 5.jpg - Ser Amantio di Nicolao

Barite mass (Vanport Flint, Middle Pennsylvanian; Nethers Flint Quarries, Flint Ridge, Ohio, USA) 7.jpg - Ser Amantio di Nicolao

Barite mass (Vanport Flint, Middle Pennsylvanian; Nethers Flint Quarries, Flint Ridge, Ohio, USA) 4.jpg - Ser Amantio di Nicolao

Barite mass (Vanport Flint, Middle Pennsylvanian; Nethers Flint Quarries, Flint Ridge, Ohio, USA) 3.jpg - Ser Amantio di Nicolao

Barite mass (Vanport Flint, Middle Pennsylvanian; Nethers Flint Quarries, Flint Ridge, Ohio, USA) 2.jpg - Ser Amantio di Nicolao

Barite mass (Vanport Flint, Middle Pennsylvanian; Nethers Flint Quarries, Flint Ridge, Ohio, USA) 1.jpg - Ser Amantio di Nicolao