Category
Browse man made rock (sedimentary analogue) specimens identified by the Rock Identifier community.
Pebble or Cobble (likely composed of sandstone or conglomerate)
Clastic Sedimentary Rock (specific name like sandstone, conglomerate, or breccia would require microscopic analysis of clast size and angularity)
Quartzite (Yellow/Orange variety)
Quartzite (primarily SiO2)
Pyrite in Shale
Iron Disulfide (FeS2)
Sandstone (Ferruginous)
Arenite with Iron Oxide (Limonite/Hematite) coating
Geode with Quartz and possibly Jasper/Hematite
Quartz (SiO2) and Chalcedony (cryptocrystalline SiO2), possibly stained by iron oxides
Herkimer Diamond
Quartz (Silica - SiO2)
Obsidian
Obsidian (volcanic glass)
Shale (with Iron Oxide staining)
Fissile Mudstone (primarily Quartz and Clay minerals)
Fish Fossil in Limestone
Lycoptera (likely) in Micritic Limestone
Dalmatian Jasper / Dalmatian Stone
Peralkaline Rock (Silicon Dioxide with Amphibole inclusions)
Sandstone
Arenite
Sandstone
Arenite (SiO2 based)
Sandstone (Quartzite-rich)
Clastic sedimentary rock (SiO2 primary)
Sandstone
Clastic Sedimentary Rock (composed mostly of SiO2)
Shale
Fissile mudstone (rich in clay minerals and quartz)
Quartz (Druzy)
Silicon Dioxide (SiO2)
Coal (Bituminous)
Sedimentary carbonaceous rock
Shale or Mudstone River Pebble
Argillaceous sedimentary rock
River Pebble (Greywacke or Siltstone)
Clastic Sedimentary Rock
Hag Stone
Perforated Sedimentary Rock
Shale or Siltstone
Sedimentary Rock (Siliciclastic)
Sandstone (likely Siltstone or fine-grained Sandstone)
Sedimentary Rock (Clastic)
Siltstone or Mudstone
Argillaceous sedimentary rock
Sandstone
Arenite (primarily SiO2)
Sandstone (Quartz Sandstone)
Arenite (primarily SiO2)
Druzy Quartz on Chalcedony Matrix
Silicon Dioxide (SiO2)
Sandstone (with carbonaceous plant fragments)
Arenite (composed primarily of SiO2)
Brown Sandstone
Arenite (primarily Quartz and Feldspar, with Iron Oxide cement)
Silty Shale
Silty Shale (Fissile Sedimentary Rock)
Shale
Mudstone (composed primarily of clay minerals like kaolinite, illite, and smectite, with quartz and calcite)
Sandstone
Arenite
Sandstone
Arenite
Sandstone
Arenite (primarily SiO2)
Sandstone with Iron Banding
Arenite with Hematite or Limonite staining (SiO2 with Fe2O3)
Garnet Schist
Garnetiferous Micaceous Schist
Limestone (specifically Travertine or Tufa)
Calcium Carbonate (CaCO3)
Sandstone (with Iron Staining)
Clastic Sedimentary Rock (primarily Quartz, SiO2)
Sandstone with Quartz Veins
Arenite (primarily SiO2 with Fe2O3 staining)
Dalmation Jasper (or Dalmation Stone)
Dalmation Stone (composed of Perthite, Quartz, and Arfvedsonite)
Sandstone (likely Greywacke or Lithic Sandstone)
Arenite / Wacke
Devil's Toenail
Gryphaea (extinct genus of foam oysters, typically composed of Calcite CaCO3)
Sandstone
Arenite (SiO2 principal)
