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

Weathered fine-grained rock, likely mudstone or siltstone

Indeterminate clastic sedimentary rock; likely lithified clay- and silt-sized grains

Iron-stained weathered rock

Unknown

Weathered stone pebble (exact rock type indeterminate)

Unidentified fine-grained rock; composition cannot be determined from the image

Fossil in Shale

Fossiliferous Shale

Shale

Argillite / Shale

Smooth river pebble (exact rock type indeterminate)

Unidentified rounded lithic clast; composition cannot be determined from the photograph

Fossil-bearing rock, possibly with a fossilized shell or coralline specimen

Indeterminate fossil in sedimentary matrix; precise identification is not possible from the image

Rounded brown pebble (rock type undetermined)

Unidentified, iron-stained lithic pebble; composition cannot be determined from the photograph

Rounded quartz-rich pebble

Chert or quartzite pebble (indeterminate from image)

Small rounded pebble

Unidentified lithic pebble; composition cannot be determined from the image

Small rounded pebble

Unidentified lithic pebble; composition cannot be determined from the image

Crushed stone aggregate

Mixed lithic aggregate; individual fragments cannot be identified from the image

Waterworn pebble, possibly iron-rich basalt or river stone

Unidentified lithic clast; composition cannot be determined reliably from the image

River Cobble (likely Siltstone or Sandstone)

Clastic Sedimentary Rock

Pyrite in Shale

Iron Disulfide (FeS2)

Riverstone (Sandstone or Quartzite)

Sedimentary Rock (likely Arenite)

Weathered sandstone fragment

Quartz-rich sandstone (compositionally uncertain)

Sandstone Grain

Clastic Sedimentary Rock Grain (SiO2 dominated)

Shale with Quartz Veins

Fissile Sedimentary Rock (SiO2)

Weathered iron-rich rock (possibly ironstone)

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

Banded sedimentary rock (likely sandstone or siltstone)

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

Likely bituminous coal

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

Brachiopod fossil

Likely a spiriferid brachiopod; exact genus and species cannot be determined from the image

Rounded river pebble, likely quartz-rich stone

Unidentified lithic clast; exact mineralogy cannot be determined from the image

Likely bituminous coal

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

Sandstone (with Siltstone/Greywacke variations)

Sedimentary Rock (Clastic)

Shale with Iron Staining

Fissile Mudrock (Sedimentary Rock)

Small rounded stone, likely a pebble

Unidentified fine-grained lithic pebble; image alone does not support a reliable mineral or rock-species identification

Fossiliferous Limestone

Limestone with fossil bioclasts (Calcium Carbonate, CaCO3)

Fish Fossil in Limestone

Lycoptera (likely) in Micritic Limestone

Quartz Geode in Sedimentary Host Rock

Silicon Dioxide (SiO2) in Carbonate Matrix

Small gray, fine-grained pebble (possibly a weathered sandstone or siltstone)

Unidentified lithic pebble; composition cannot be determined from the image

Rounded brown pebble

Unidentified lithic pebble; composition cannot be determined from the image

Small rounded pebble, likely quartz-rich river or beach stone

Unidentified lithic pebble; exact rock type cannot be determined from the image

Likely small iron-rich concretion or weathered mineral fragment

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

Sedimentary Rock with Crafts (Pet Rock)

Sedimentary rock decorated with synthetic materials