Sandstone
Sandstone (Quartzose/Feldspathic Sandstone)
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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Limestone
Sedimentary rock composed mainly of calcite (CaCO3)
sedimentary
Quartz pebble
Silicon dioxide (SiO2)
mineral
Chert (specifically Flint or Dark Chalcedony)
Silicon Dioxide (SiO2)
sedimentary
Calcite (Honey Calcite and Agate)
Calcium Carbonate (CaCO3)
mineral
Iron-rich chert or jasper
Microcrystalline quartz (SiO₂), colored by hematite/goethite inclusions
sedimentary
Chert
Chert (SiO2)
sedimentary
Chert (specifically Gray Chert)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Greywacke (Sandstone)
Lithic wacke
sedimentary
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Sandstone (Red Sandstone)
Arenite
sedimentary
Jasper River Stone
Silicon Dioxide with Iron Oxide impurities (SiO2 + Fe2O3)
sedimentary
River Rock (Sandstone or Quartzite)
Clastic Sedimentary Rock / Quartzite
sedimentary
Gravel or Crushed Stone
Fragmented Aggregate Stone
sedimentary or igneous fragment
Gneiss
Gneiss
metamorphic
Conglomeratic sandstone or breccia
Lithic arkose / polymictic conglomeratic sandstone
sedimentary
Titanium Quartz (Aura Quartz)
Silicon Dioxide (SiO2) treated with Titanium
mineral
Sandstone (likely Arkosic)
Clastic Sedimentary Rock (primarily SiO2 with Feldspar)
sedimentary
Sandstone (Ferruginous)
Arenite (complex silicate composition with iron oxides)
sedimentary
Fossiliferous Limestone
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Sandstone (Quartzose Sandstone)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Painted Pet Rock (Quartzite/Sandstone base)
Silicon Dioxide (SiO2) with anthropomorphic acrylic embellishments
sedimentary
Gneiss
Gneiss (Foliated Metamorphic Rock)
metamorphic
Limestone (likely weathered)
Limestone (Mainly Calcium Carbonate, CaCO3)
sedimentary
Septarian Nodule (Galt)
Calcareous concretion / Septarian concretion
sedimentary
Fossil Shell
Invertebrate fossil (Mollusca)
fossil
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Sandstone (likely Quartzose)
Arenite
sedimentary
Shale or Argillite
Shale (fine-grained clastic sedimentary rock) or Argillite (low-grade metamorphic rock derived from shale)
Sedimentary or Metamorphic (low grade)
Coal
Anthracite / Bituminous Coal
sedimentary
River Cobble (Quartzite or Sandstone)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone
Clastic sedimentary rock (quartz arenite)
sedimentary
Quartz (Small Fragment)
Silicon Dioxide (SiO2)
mineral
Sandstone
Clastic sedimentary rock (primarily quartz arenite)
sedimentary
Sandstone (with biological crust)
Arenite (SiO2 based)
sedimentary
Chert (often called Flint in various colors)
Silicon Dioxide (SiO2)
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Epidote (Unakite component) / Green Quartzite
Ca2(Al,Fe)3(SiO4)3(OH)
metamorphic
Gneissic Granite
Granite Gneiss
metamorphic
Sandstone
Arenite
sedimentary
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Red Sandstone
Arenite (with iron oxide cement)
sedimentary