Sandstone (Quartzose Sandstone)
Arenite (primarily SiO2 with minor Fe2O3)
sedimentary
Category
Sedimentary Rock (Specifically A Clastic Sedimentary Rock Formed Into A Cobble)
Browse sedimentary rock (specifically a clastic sedimentary rock formed into a cobble) specimens identified by the Rock Identifier community.
Sandstone
Arenite (SiO2 based)
sedimentary
Red Sandstone
Arenite (with Iron Oxide)
sedimentary
Sandstone
Arenite (SiO2 based with various mineral cements)
sedimentary
Sandstone
Arenite (SiO2 principal)
sedimentary
Turritella Agate
Silicified Elimia tenera Fossil (SiO2)
sedimentary
Sandstone (Stream Pebble)
Arenite (primarily SiO2)
sedimentary
River Cobble (likely Quartzite or Limestone)
SiO2 (Quartzite dominant) or CaCO3 (Limestone dominant)
metamorphic or sedimentary
Banded Sandstone (Wonderstone)
Sandstone with Liesegang Rings (SiO2 with Iron Oxides)
sedimentary
Granite Cobble
Granite (Phaneritic Quartz-Feldspar Felsic Rock)
igneous
Chert (specifically Flint or Dark Chert)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Sandstone Concretion
Clastic sedimentary rock (primarily Silica, SiO2, or Calcium Carbonate, CaCO3)
sedimentary
Sandstone Concretion
Septarian or Carbonate-cemented Sandstone Concretion
sedimentary
Coarse Sand Grain / Lithic Fragment
Clastic Sediment (Lithic fragment or Quartz/Feldspar grain)
sedimentary
Sandstone (Ferruginous)
Arenite (primarily SiO2 with iron oxide cement)
sedimentary
Shale or Slate with Quartz Veins
Shale (fine-grained clastic sedimentary rock) or Slate (low-grade metamorphic rock formed from shale) with Quartz (SiO2) veins
Metamorphic, likely Sedimentary with Quartz veins
Sandstone
Arenite
sedimentary
Red Sandstone
Arenite
sedimentary
Sandstone (Red)
Arenite (SiO2 with Fe2O3)
sedimentary
Chert (specifically Jasper or Brown Chert node)
Microcrystalline Quartz (SiO2)
sedimentary
Coquina
Coquina (Bioclastic Limestone)
sedimentary
Breccia
Clastic Breccia (SiO2/CaCO3 dominated)
sedimentary
Sedimentary Breccia
Clastic Breccia (CaCO3/SiO2 matrix)
sedimentary
Sandstone (Red)
Arenite (primarily SiO2 with Iron Oxide staining)
sedimentary
Pet Rock (Man-made Quartzite or Granite Cobble)
Silicon dioxide (SiO2) mixture; commonly composed of Quartz, Feldspar, and Mica
igneous or metamorphic (base stone); anthropogenic (decoration)
Sandstone (Ferruginous Concretion)
Ferruginous Sandstone Concretion / SiO2 with Fe2O3 cement
sedimentary
Shale
Shale (Lutite)
sedimentary
Ferruginous Sandstone
Arenite with Hematite/Limonite cement (SiO2 + Fe2O3)
sedimentary
Banded Sandstone (Liesegang Rings)
Sedimentary sandstone with Iron oxide precipitates
sedimentary
Sandstone (with Lichen)
Arenite (primarily SiO2)
sedimentary
Basalt (River Rock Cobble)
Extrusive mafic volcanic rock (Basalt)
igneous
Shale with Vein Infillings
Shale (a fine-grained clastic sedimentary rock). The veins could be Calcite (CaCO3), Quartz (SiO2), or other minerals.
Sedimentary Rock
Chert (specifically Black Chert or Flint)
Cryptocrystalline Quartz (SiO2)
sedimentary
Asphalt Concrete
Bituminous conglomerate
sedimentary
Agate (specifically Waterline or Onyx-type Agate)
Silicon Dioxide (SiO2) - variety Chalcedony
mineral
Red Sandstone
Arenite (primarily Quartz, SiO2, with Iron Oxide cementing agent)
sedimentary
Quartzite / Sandstone / Chert Mix
Silicon Dioxide (SiO2)
sedimentary and metamorphic
Sandstone concretion (Ironstone-stained)
Arenite with Limonite/Hematite staining (Silica-based with Iron Oxides)
sedimentary
Shale with Pyrite
Clastic sedimentary rock containing Iron Disulfide (FeS2)
sedimentary
Sandstone (likely Fossilized Wood or Concrete Simulacrum)
Arenite / Silicified Wood / Anthropogenic Concrete
sedimentary
Sandstone with Ironstone Banding
Clastic Sandstone (composed of Quartz with Hematite/Limonite bonding)
sedimentary
Quartz (specifically Milky/Gray Quartz vein)
Silicon Dioxide (SiO2)
mineral