Wikimedi'Òc

Flint with drusy quartz-lined fracture (Upper Mercer Flint, Middle Pennsylvanian; Nellie West Outcrop, Coshocton County, Ohio, USA) 1 (31919569895).jpg - Ser Amantio di Nicolao

Quartz crystal-lined vug with barite in flint meganodule (Vanport Flint, Middle Pennsylvanian; Nethers Flint Quarries, eastern Flint Ridge, Ohio, USA) 3 (23877234875).jpg - Ser Amantio di Nicolao

Quartz crystal-lined vug in flint meganodule (next to Brownsville Road, Flint Ridge, Ohio, USA) (29894948671).jpg - Ser Amantio di Nicolao

Drusy quartz-coated brecciated flint (Vanport Flint, Middle Pennsylvanian; Nethers Flint Quarries, Flint Ridge, Ohio, USA) (24764787577).jpg - Ser Amantio di Nicolao

Flint (Vanport Flint, Middle Pennsylvanian; Nethers Flint Quarries, Flint Ridge, Ohio, USA) 122 (39875910051).jpg - Ser Amantio di Nicolao

Flint (Vanport Flint, Middle Pennsylvanian; Nethers Flint Quarries, Flint Ridge, Ohio, USA) 127 (38976274265).jpg - Ser Amantio di Nicolao

Flint (Vanport Flint, Middle Pennsylvanian; Nethers Flint Quarries, Flint Ridge, Ohio, USA) 140 (38980254405).jpg - Ser Amantio di Nicolao

Quartz on flint breccia clast (Vanport Flint, Middle Pennsylvanian; Nethers Flint Quarries, Flint Ridge, Ohio, USA) (41873611951).jpg - Ser Amantio di Nicolao

Quartz-pebble conglomerate (Black Hand Sandstone, Lower Mississippian; railroad cut west of Black Hand Gorge, Ohio, USA) 4 (31028211251).jpg - Ser Amantio di Nicolao

Geode with sphalerite, barite, dolomite, and quartz (Monroe County, Ohio, USA) 1 (32491061231).jpg - Ser Amantio di Nicolao

Geode with sphalerite, barite, dolomite, and quartz (Monroe County, Ohio, USA) 2 (32573398156).jpg - Ser Amantio di Nicolao

Flint (Vanport Flint, Middle Pennsylvanian; Nethers Flint Quarries, Flint Ridge, Ohio, USA) 173.jpg - Ser Amantio di Nicolao

Flint (Vanport Flint, Middle Pennsylvanian; Nethers Flint Quarries, Flint Ridge, Ohio, USA) 172.jpg - Ser Amantio di Nicolao

Flint (Vanport Flint, Middle Pennsylvanian; Nethers Flint Quarries, Flint Ridge, Ohio, USA) 174.jpg - Ser Amantio di Nicolao

Quartz paleopebbles (Stebbins Gulch, Geauga County, Ohio, USA) 2.jpg - Ser Amantio di Nicolao