Coal (Bituminous or Anthracite)
Carbonaceous Sedimentary Rock
sedimentary
Category
Sedimentary Rock (Possibly Composed Of Various Minerals)
Browse sedimentary rock (possibly composed of various minerals) specimens identified by the Rock Identifier community.
Learn about Sedimentary Rock (Possibly Composed Of Various Minerals) in the encyclopedia
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Sandstone (likely Graywacke or Arkose)
Arenite
sedimentary
Diorite
Intermediate Phaneritic Igneous Rock (Diorite)
igneous
Shale or Siltstone
Sedimentary Clastic Rock (Variable mineral composition including quartz and clay minerals)
sedimentary
Mica-rich metamorphic rock, likely schist
Biotite–muscovite schist, possibly garnet-bearing
metamorphic
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone (Quartzose Sandstone)
Arenite (composed primarily of SiO2)
sedimentary
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Sandstone (specifically Picture Sandstone or Wonderstone)
Arenite (composed primarily of SiO2)
sedimentary
Red Sandstone
Quartzose Sandstone (primarily quartz grains cemented by iron oxides)
sedimentary
Quartz (Chert/Quartzite variant)
Silicon Dioxide (SiO2)
mineral
Shale
Fissile Mudstone (primarily composed of clay minerals and quartz grains)
sedimentary
Gneiss (specifically a Hornblende Gneiss or Micaceous Gneiss)
Gneiss (metamorphic rock composed primarily of quartz, feldspar, and mafic minerals)
metamorphic
Granite (Thin Section)
Granite (Felsic Plutonic Rock)
igneous
Quartz (Jasper / Chert)
Silicon Dioxide (SiO2)
sedimentary
Granite fragment
Granite (Felsic intrusive igneous rock)
igneous
Dalmatian Stone
Dalmatian Jasper (a misnomer) / Perthitic Feldspar Rock
igneous
Shark Tooth Fossil
Vertebrate fossilized tooth (various genera such as Carcharodon, Otodus, or Negaprion)
fossil
Sandstone Pebble
Sedimentary Rock (Quartzose Sandstone)
sedimentary
Quartz Vein Rock
Silicon Dioxide (SiO2)
mineral
Sandstone (River Stone)
Arenite (composed primarily of SiO2)
sedimentary
Vesicular basalt (likely scoria)
Vesicular basalt; chiefly plagioclase, pyroxene, olivine, and iron oxides
igneous
Granite
Granite (Mainly Quartz, Feldspar, and Mica)
igneous
Fossiliferous Limestone
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Sandstone (Ferruginous)
Arenite (with iron oxide cement)
sedimentary
Sandstone (with prominent jointing/fractures)
Arenite (composed primarily of SiO2)
sedimentary
Sandstone Pebble
Arenite
sedimentary
Shale
Shale (clastic sedimentary rock composed of silt and clay-sized particles)
sedimentary
Sandstone
Sedimentary Rock (Quartz arenite)
sedimentary
Granitic Pegmatite Intrusion in Host Rock
Pegmatite dike in amphibolite or schist
igneous and metamorphic
Sandstone (Quartzose Sandstone)
Arenite
sedimentary
Sandstone (specifically Flagstone)
Arenite (primarily composed of SiO2)
sedimentary
Sandstone (Stream Pebble)
Arenite (primarily SiO2)
sedimentary
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone (with Iron Staining)
Clastic sedimentary rock (primarily SiO2 with Fe2O3 oxides)
sedimentary
Gneiss (likely)
Gneiss
Metamorphic
Quartz Pebble
Silicon dioxide (SiO2)
sedimentary
Sandstone
Arenite
sedimentary
Granite and Igneous Mix
Phaneritic Felsic to Mafic Intrusive Rocks
igneous
Quartz-bearing iron-rich rock, possibly quartzite or hydrothermal breccia
Quartz (SiO₂) with iron oxides/hydroxides, likely limonite/goethite; exact host rock is uncertain from the photograph
metamorphic
Agate / Chalcedony Pebble
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (Sedimentary rock composed of sand-sized grains)
sedimentary