Rock (Likely Sedimentary)

Pebble (likely Sandstone or Granitic Pebble)

Clastic Sediment (or specific rock type, e.g., Arenite, Granitoid Pebble)

Quartz (Druzy on Matrix)

Silicon Dioxide (SiO2)

Weathered Sedimentary Rock

Sedimentary Rock

Weathered Sandstone or Siltstone

Sedimentary Rock

Sandstone (Pebble)

Arenite

Shale or Slaty Mudstone

Argillaceous sedimentary rock

Iron-stained weathered rock

Unknown

Fossil in Shale

Fossiliferous Shale

Shale

Argillite / Shale

Rounded quartz-rich pebble

Chert or quartzite pebble (indeterminate from image)

Pyrite in Shale

Iron Disulfide (FeS2)

River Cobble (likely Siltstone or Sandstone)

Clastic Sedimentary Rock

Weathered sandstone fragment

Quartz-rich sandstone (compositionally uncertain)

Banded sedimentary rock (likely sandstone or siltstone)

Layered siliciclastic sedimentary rock; exact identification is not possible from the image alone

Weathered iron-rich rock (possibly ironstone)

Indeterminate ferruginous rock; likely iron-oxide-cemented sandstone or ironstone

Sandstone Grain

Clastic Sedimentary Rock Grain (SiO2 dominated)

Shale with Quartz Veins

Fissile Sedimentary Rock (SiO2)

Riverstone (Sandstone or Quartzite)

Sedimentary Rock (likely Arenite)

Fossiliferous Limestone

Limestone with fossil bioclasts (Calcium Carbonate, CaCO3)

Quartz Geode in Sedimentary Host Rock

Silicon Dioxide (SiO2) in Carbonate Matrix

Likely bituminous coal

Coal, predominantly carbon-rich organic matter; exact rank cannot be confirmed from the image

Shale with Iron Staining

Fissile Mudrock (Sedimentary Rock)

Likely small iron-rich concretion or weathered mineral fragment

Indeterminate; possibly limonite/goethite-bearing material with quartz or feldspar

Sandstone (with Siltstone/Greywacke variations)

Sedimentary Rock (Clastic)

Fish Fossil in Limestone

Lycoptera (likely) in Micritic Limestone

Conglomeratic Sandstone

Clastic Sedimentary Rock

Shale

Fissile Siliciclastic Sedimentary Rock

Sedimentary Rock with Crafts (Pet Rock)

Sedimentary rock decorated with synthetic materials

Sandstone (Quartzite-rich)

Clastic sedimentary rock (SiO2 primary)

Shale (sub-type: Carbonaceous Shale)

Lutaceous Sedimentary Rock

Sandstone (likely Arkosic)

Clastic Sedimentary Rock

Painted Garden Rock

Coated Siltstone or Mudstone

Unidentified small rocks or gravel

Small red-brown mineral or rock fragment

Unidentified; possibly iron-oxide-rich jasper, garnet, or weathered sulfide

Stream-Rounded Shale or Mudstone

Argillaceous sedimentary rock

Painted River Rock

Painted Quartzite or Smooth Siltstone

Shale

Clastic sedimentary rock (primarily clay and silt minerals)

Sandstone (likely Siltstone or fine-grained Sandstone)

Sedimentary Rock (Clastic)

Green-gray stone pebble (not reliably identifiable from the image)

Undetermined; possibly a fine-grained sedimentary rock such as mudstone or siltstone

Weathered brown rock fragment

Indeterminate; possibly iron-stained sandstone, mudstone, or weathered limestone

Polished river pebble

Indeterminate; likely fine-grained quartz-rich sedimentary rock or weathered volcanic rock

Jasper with Quartz

Silicon dioxide (SiO2)