Sandstone (Stream-rounded Cobble)
Arenite (composed primarily of SiO2, Silica)
sedimentary
Category
Mineral, Possibly Rock Fragment Containing A Mineral
Browse mineral, possibly rock fragment containing a mineral specimens identified by the Rock Identifier community.
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Limonitic Sandstone with Inclusion
Limonitic Quartz Sandstone (primarily SiO2 with FeO(OH)·nH2O)
sedimentary
Orbicular Granite
Orbicular Granidiorite / Plutonic Igneous Rock
igneous
Banded Gneiss (with possible weathered sulfide or iron staining)
Gneiss, potentially with iron oxide/hydroxide staining (e.g., limonite) or weathered sulfides
Metamorphic
Sandstone (Ferruginous)
Arenite (Fe-rich SiO2)
sedimentary
Sandstone Pebble
Arenite (primarily SiO2)
sedimentary
Quartz / Common Opal
Silicon Dioxide (SiO2)
mineral
Sandstone (likely Calcareous or Quartz-rich)
Arenite (SiO2 based typically)
sedimentary
Note regarding baguette production (not a rock)
Digital text image - Somali language
not a rock
Red Sandstone
Arenite (primarily composed of SiO2 with Fe2O3 cement)
sedimentary
Chalcedony or Chert/Jasper with secondary mineral staining
SiO2 (for chalcedony/quartz) with possible secondary copper minerals (e.g., CuSiO3·nH2O for chrysocolla, Cu2(CO3)(OH)2 for malachite) or iron oxides/hydroxides.
Mineral, potentially a rock with chalcedony/jasper.
Quartz (Chert/Chalcedony variety)
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (composed primarily of SiO2, or Silicon Dioxide)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
River Stone / Pebble
Clastic Sediment (composed largely of Quartz, Feldspar, and various rock fragments)
Mineral, Sediment
Sandstone (likely Quartzose Sandstone)
Arenite (SiO2 based)
sedimentary
Granite with Epidote
Granite, containing quartz, feldspar, and epidote
Igneous
Concrete Fragment
Hardened Portland Cement Composite
Anthropogenic (Man-made material mimicking sedimentary rock)
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone (lithic wacke/arenite)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Ferruginous Sandstone (Ironstone)
Clastic sedimentary rock (SiO2 with Fe2O3/FeO(OH) cement)
sedimentary
Fossiliferous Shale
Laminated Mudrock with plant fossils
sedimentary
Quartz (Citrine or Iron-Stained variety)
Silicon Dioxide (SiO2)
mineral
Sandstone (specifically Flagstone)
Arenite (primarily composed of SiO2)
sedimentary
Sandstone (Ferruginous)
Clastic Sedimentary Rock (SiO2 with FeO/Fe2O3)
sedimentary
Amygdaloidal Basalt
Amygdaloidal Basalt (with secondary mineral infilling)
igneous
Quartz Geode Fragment
Silicon Dioxide (SiO2)
mineral
Fossiliferous Limestone
Limestone with fossil inclusions (CaCO3)
sedimentary
Fossilized Bone Fragment
Permineralized Vertebrate Fossil (Hydroxyapatite replaced by Minerals)
sedimentary
Quartz
Silicon Dioxide (SiO₂)
Mineral
Granite
Phaneritic Felsic Intrusive Igneous Rock
igneous
Unknown Rock Specimen
igneous
Quartz Geode Fragment
Silicon Dioxide (SiO2)
mineral
Red Sandstone
Arenite (ferruginous sandstone)
sedimentary
Sandstone (Ferruginous)
Arenite with Iron Oxides
sedimentary
Basalt
Mafic Igneous Rock (primarily Plagioclase Feldspar and Pyroxene)
igneous
Fossiliferous Limestone
Fossiliferous Calclutite / Bio-calcarenite (CaCO3)
sedimentary
Conglomerate (Puddingstone)
Conglomerate (specifically, clastic sedimentary rock)
Sedimentary
Unidentified Rock Fragment
Unknown
Rock
Sandstone (with Iron Oxide)
Arenite with Limonite/Hematite staining
sedimentary
Sandstone
Arenite
sedimentary