Red Sandstone
Arenite (primarily Quartz with Hematite cement)
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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Bauxite
Bauxite (Aluminum Ore)
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Red Sandstone
Sedimentary Litharenite / Quartz Arenite
sedimentary
Greenish Metamorphic Rock (likely containing epidote or chlorite)
Metamorphic rock, possibly epidosite or greenstone
Metamorphic
Sandstone
Arenite (SiO2 with various cementation agents)
sedimentary
Greenstone / Greenschist
Greenschist facies metamorphic rock (composed primarily of chlorite, actinolite, and epidote)
metamorphic
Sandstone Pebble
Sedimentary Clastic Rock (Quartz Arenite)
sedimentary
Sandstone (lithic/greywacke variety)
Arenite (composed primarily of SiO2 with various lithic fragments)
sedimentary
Bauxite
Bauxite (principal ore of aluminum, primarily Al(OH)3)
sedimentary
Bauxite (Laterite)
Hydrated aluminum oxides (Al2O3·nH2O)
sedimentary
Phyllite (possibly low-grade greenish slate)
Foliated metamorphic rock composed mainly of very fine-grained quartz, mica, and chlorite; approximate composition varies and has no single fixed chemical formula
metamorphic
Starfish Fossil
Asteroidea fossil
fossil
Vesicular basalt (likely weathered lava rock)
Basalt; fine-grained mafic volcanic rock composed chiefly of plagioclase, pyroxene, and commonly olivine
igneous
Sandstone
Arenite (Sedimentary Rock)
sedimentary
Brecciated Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Sandstone (Graywacke)
Clastic Sedimentary Rock (Lithic Sandstone)
sedimentary
Brecciated Jasper
Silicon Dioxide (SiO2) with Hematite impurities
sedimentary
Bauxite
Bauxite (Al2O3·2H2O mixed with iron oxides)
sedimentary
Dalmatian Jasper / Dalmatian Stone
Peralkaline Rock (Silicon Dioxide with Amphibole inclusions)
igneous
River Rock (River Cobbles)
Fluvial Conglomerate Clasts (primarily composed of various minerals such as Quartz, SiO2)
sedimentary
Granite
Phaneritic Felsic Igneous Rock
igneous
Geode with Quartz and possibly Jasper/Hematite
Quartz (SiO2) and Chalcedony (cryptocrystalline SiO2), possibly stained by iron oxides
Mineral/Sedimentary Geode
Bauxite
Bauxite (Mixture of Hydrous Aluminum Oxides)
sedimentary
Banded sandstone pebble
Quartz-rich lithic sandstone; exact provenance and composition require testing
sedimentary
Red Sandstone
Arenite (Iron-rich)
sedimentary
Bauxite
AlOx(OH)3-2x (mixture of Gibbsite, Boehmite, and Diaspore)
sedimentary
Concrete or artificial stone core sample
Artificial conglomerate
sedimentary
Limonite (Iron Ore)
FeO(OH)·nH2O (Hydrated iron(III) oxide-hydroxide)
mineral
Basalt
Basalt
Igneous
Fossilized Shark Tooth
Elasmobranchii (various species, possibly Carcharias or Odontaspis)
fossil
Sandstone (Tumbled/River Pebble)
Arenite (composed primarily of SiO2)
sedimentary
Red Sandstone
Sandstone (principally Quartz with Iron Oxide coating)
sedimentary
Dalmatian Stone
Dalmatian Jasper (a trade name for an igneous microcrystalline rock composed mostly of feldspar, quartz, and dravite)
igneous
Pink Granite
Phaneritic Felsic Igneous Rock (composed primarily of K-Feldspar, Quartz, and Plagioclase)
igneous
Bauxite
Bauxite (Al(OH)3, AlO(OH), AlOOH)
sedimentary
Granite (Pink/Red Granite)
Phaneritic Felsic Igneous Rock
igneous
Quartz pebble
Silicon Dioxide (SiO2)
mineral
Dalmatian Stone
Dalmatian Jasper (a misnomer for an Aplite with Arfvedsonite spots)
igneous
Shale / Mudstone
Laminated Mudrock (Siliciclastic Sedimentary Rock)
sedimentary
Bauxite
Bauxite (Al(OH)3, AlO(OH))
sedimentary
Bauxite
Bauxite (Al2O3·nH2O)
sedimentary