Sandstone (Arkose/Quartzose)
Arenite (SiO2 based clastic rock)
sedimentary
Category
Anthropogenic (Man Made Material Mimicking Sedimentary Rock)
Browse anthropogenic (man made material mimicking sedimentary rock) specimens identified by the Rock Identifier community.
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Banded Chert (Agate-like Flint)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Jasper and Quartz Breccia
Silicified Breccia / Microcrystalline Quartz
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Sandstone
Arenite
sedimentary
Ferruginous Sandstone Pebble
Arenite with Iron-Oxide Cement (SiO2 with Fe2O3/FeO(OH) staining)
sedimentary
Red Sandstone
Arenite (predominantly Quartz with Hematite cementation)
sedimentary
Sandstone (Ferruginous)
Arenite (with iron oxide cement, Fe2O3)
sedimentary
Jasper
Silicon dioxide (SiO2) with impurities
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 (Ferruginous)
Arenite (SiO2 with Iron Oxide impurities)
sedimentary
Chert (Jasper/Agate variety)
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3 staining)
sedimentary
Chert (variously Flints)
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Sandstone (Ferruginous)
Arenite (with high iron oxide content)
sedimentary
Siltstone with flute casts or scratch marks
Clastic Sedimentary Rock (Siltstone/Fine-grained Sandstone)
sedimentary
Chert / Flint Nodule
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Travertine (Tufa)
Chemical Limestone (CaCO3)
sedimentary
Polished red jasper beads
Jasper, microcrystalline quartz (SiO₂), colored mainly by iron oxides
mineral
Granitic Gneiss
Gneiss (high-grade metamorphic rock)
metamorphic
Tumbled jasper or chert
Microcrystalline quartz (SiO₂), possibly iron-bearing jasper
mineral
Chert (River Pebble)
Microcrystalline Quartz (SiO2)
sedimentary
Limonite-stained Chert
Silicon Dioxide (SiO2) with Hydrated Iron Oxide (FeO(OH)·nH2O)
sedimentary
Ferruginous Sandstone (Ironstone)
Clastic sedimentary rock (SiO2 with Fe2O3/FeO(OH) cement)
sedimentary
Chert (Red Jasper variant)
Microcrystalline Quartz (SiO2)
sedimentary
Likely pale limestone or calcite-rich rock
Calcite-bearing limestone; chiefly calcium carbonate (CaCO₃)
sedimentary
Fossiliferous Limestone containing a Brachiopod or Mollusk Impression
Biogenic Sedimentary Rock / Fossiliferous Limestone
sedimentary
Chert (Iron-stained)
Microcrystalline Quartz (SiO2)
sedimentary
Brachiopod Fossil in Limestone
Phylum Brachiopoda (likely Order Spiriferida), CaCO3 (Calcite)
sedimentary
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Quartz (Smoky/Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Conglomeratic breccia
Clast-supported polymictic conglomerate/breccia, cemented by silica- or carbonate-rich matrix
sedimentary
Chert (variations include Flint or Jasper)
Silicon Dioxide (SiO2)
sedimentary
Chert (Flint Nodules)
Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Yellow Jasper/Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Likely weathered sandstone or iron-stained sedimentary fragment
Quartz-rich sandstone; exact identification requires testing
sedimentary
Sandstone (Ferruginous)
Arenite (SiO2 with Fe-oxide cement)
sedimentary
Chert (Jasper/Agate variety)
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone (likely Quartzose Sandstone)
Arenite (SiO2 principal composition)
sedimentary
Red Sandstone
Arenite (SiO2 with Fe2O3)
sedimentary
Sandstone (with Iron Staining)
Quartz Arenite / Ferruginous Sandstone
sedimentary