Sandstone (lithic/quartz variant)
Clastic sedimentary rock (SiO2 predominant)
sedimentary
Category
Rock (Likely Sedimentary)
Browse rock (likely sedimentary) specimens identified by the Rock Identifier community.
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Basalt pebble
Aphanitic Mafic Igneous Rock
igneous
Clear Quartz (Faceted Crystal)
Silicon Dioxide (SiO2)
mineral
Biotite schist (likely graphite-bearing)
Mica schist; chiefly quartz + biotite mica, with possible graphite and feldspar
metamorphic
Chert (Iron-stained)
Chert (primarily Microcrystalline Quartz, SiO2)
sedimentary
Quartzite Sandstone / Quartz Sandstone
Quartz Sandstone (SiO2 with minor mineral impurities)
sedimentary
Orange calcite
Calcite (CaCO₃), likely honey/orange calcite
mineral
Bivalve Fossil
Bivalvia (Phylum Mollusca)
Fossil
Coal
Carbonaceous sedimentary rock / Lignite to Bituminous coal
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Flint or chert fragment
Microcrystalline quartz (SiO₂), likely flint/chert
sedimentary
Iron-rich flint or chert fragment
Microcrystalline quartz (SiO₂), likely ferruginous chert
sedimentary
Fossilized Shark Tooth
Fossilized Elasmobranchii tooth (likely Odontaspis or Carcharias)
sedimentary
Trilobite Fossil
Trilobita (Class), likely Phacopid or Asaphid order
sedimentary
Fossilized Shark Tooth (Fragment)
Elasmobranchii fossil (likely Cretalamna or Squalicorax genus)
sedimentary
Quartz-Veined Sandstone
Quartz-veined Arenite
sedimentary
Sandstone (Pebble)
Sandstone (SiO2 with matrix/cement)
sedimentary
Sandstone
Sedimentary Rock (Quartz Sandstone)
sedimentary
Sandstone
Sedimentary Rock (Quartz arenite)
sedimentary
Sandstone
Sedimentary Rock (Quartz arenite)
sedimentary
Sandstone
Quartzose Sandstone (Sedimentary Rock)
sedimentary
Banded Sandstone
Quartz-rich Arenite Sandstone
sedimentary
Sandstone
Arenite (SiO2 based clastic rock)
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Chert or Flint (polished/water-worn)
Chert (a microcrystalline or cryptocrystalline variety of quartz, SiO2). Flint is a specific variety of chert.
Sedimentary (most likely, as Chert is a sedimentary rock often found as nodules in limestone or as bedded deposits; however, it can also form by metasomatic replacement, which leans towards metamorphic processes under certain conditions)
Garnet (likely Pyrope or Almandine)
Garnet Group (complex nesosilicate minerals, e.g., Pyrope Mg3Al2(SiO4)3, Almandine Fe3Al2(SiO4)3, Spessartine Mn3Al2(SiO4)3, Grossular Ca3Al2(SiO4)3, Andradite Ca3Fe2(SiO4)3, Uvarovite Ca3Cr2(SiO4)3). The vivid red color in the image strongly suggests Pyrope or Almandine.
Mineral
Sandstone
Sandstone (clastic sedimentary rock)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Jasper (likely Kambaba or Crocodile Jasper variety)
Silicon Dioxide (SiO2) with inclusions
sedimentary
Chert or heavily weathered flint
Microcrystalline quartz (SiO₂), likely chert/flint
sedimentary
Dark flint or chert fragment
Microcrystalline quartz (SiO₂), likely flint/chert
sedimentary
Brachiopod Fossil
Phylum Brachiopoda (likely Order Rhynchonellida or Spiriferida)
sedimentary
Fossilized bivalve shell
Bivalvia (likely a venerid or similar clam); shell composed mainly of CaCO₃ as aragonite/calcite
fossil
Magnetite (likely with weathered Limonite/Hematite)
Magnetite (Fe3O4) with iron oxide weathering
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Sandstone
Sedimentary Rock (Quartz Sandstone)
sedimentary
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Sandstone
Sedimentary Clastic Rock (Quartzose Sandstone)
sedimentary
Quartz (or Chert/Flint)
Silicon Dioxide (SiO2)
mineral
Sandstone (Ferruginous)
Sandstone (SiO2 with iron oxide impurities)
sedimentary
Sandstone
Sedimentary Rock (Quartz arenite / Lithic sandstone)
sedimentary