Shale
Sedimentary Shale
Category
Browse sedimentary rock (metamorphosed) specimens identified by the Rock Identifier community.
Shale
Sedimentary Shale
Shale and Pebble Fragment
Sedimentary Rock (Mudstone/Shale with Silica Pebble)
Weathered fine-grained stone, likely sandstone or quartzite
Quartz-rich sandstone (possibly weakly metamorphosed quartzite); predominantly SiO₂
Quartzite
Quartzite
Shale
Laminated Fissile Pelite
Geode
Quartz nodule / Chalcedony-lined cavity
Unakite
Epidotized Granite
Sandstone pebble
Sandstone (mainly Quartz, SiO2)
Fossil Shell
Invertebrate fossil (Mollusca)
Shale
Fissile mudrock (composed of clay-sized particles and detrital grains)
Shale
Fissile Siliciclastic Sedimentary Rock
Red Sandstone
Clastic Sandstone (typically Quartz-rich with Iron Oxide)
Sedimentary Rock (Limestone or Siltstone pebble)
Sedimentary rock fragment
Marble
Marble (metamorphosed limestone/dolostone). Predominantly composed of Calcite (CaCO3) for marble derived from limestone, or Dolomite (CaMg(CO3)2) for marble derived from dolostone.
Sedimentary Rock Fragments
Clastic Sedimentary Rock
Quartz-rich sandstone or quartzite fragment
Likely quartz arenite; possibly weakly metamorphosed quartzite (mostly SiO₂)
Sandstone
Clastic Sedimentary Rock
Sandstone Grain
Clastic Sedimentary Rock Grain (SiO2 dominated)
Fossilized Brachiopod or Gastropod in Chert/Limestone
Phylum Brachiopoda / Mollusca
Weathered Sandstone or Siltstone
Sedimentary Rock
Sandstone or Limestone
Sedimentary Rock
Bivalve Seashell Fossil
Class Bivalvia
Serpentinite
Serpentinite (a rock composed predominantly of serpentine group minerals)
Sandstone
Quartz Sandstone (predominantly)
Shale
Shale (clastic sedimentary rock)
Shale
Shale (Lutite)
Shale
Fissile mudrock (composed primarily of clay minerals and quartz)
Shale (with Iron Staining)
Argillaceous mudstone / Shale
Iron-rich sandstone or ferruginous quartzite
Hematite/goethite-bearing quartz sandstone; possibly weakly metamorphosed to quartzite
Shale (sub-type: Carbonaceous Shale)
Lutaceous Sedimentary Rock
Conglomerate (Quartz Pebble Conglomerate)
Quartz Pebble Conglomerate
Shale
Clastic sedimentary rock (primarily clay and silt minerals)
Chert (Agatized/Chalcedony variety)
Microcrystalline Quartz (SiO2)
Shale
Shale (Lutite)
Fossil Assortment and Geological Specimens
Various (including Ammonoidea)
Shale (or Mudstone)
Laminose Mudrock (composition: clay minerals, quartz, and mica flakes)
Metaconglomerate
Metaconglomerate (Quartzite conglomerate)
Dalmatian Jasper
Peralkaline Quartz-Feldspar Rock with Arfvedsonite
Pitted Sedimentary Rock / Cupstone
Sedimentary rock with weathering pit (arenite / sandstone)
Sedimentary Sandstone
Arenite (Sedimentary Rock)
Sodalite
Sodalite - Na8(Al6Si6O24)Cl2
Sedimentary Rock with Crafts (Pet Rock)
Sedimentary rock decorated with synthetic materials