Sandstone
Arenite (primarily SiO2)
sedimentary
Category
Sedimentary (Fossil)
Browse sedimentary (fossil) specimens identified by the Rock Identifier community.
Ironstone Concretion (Limonite/Goethite)
Goethite-rich Concretion (FeO(OH))
sedimentary
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone (Quartzose)
Arenite (composed mainly of SiO2)
sedimentary
Sandstone
Arenite (SiO2 based with quartz grains)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Sandstone (Quartzite texture)
Arenite (SiO2 secondary)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Limestone (specifically Tufa or Travertine)
Calcium Carbonate (CaCO3)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Sandstone (with Iron Staining)
Clastic sedimentary rock (primarily SiO2 with Fe2O3 oxides)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone (Ferruginous)
Arenite (with iron oxide cement)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Blue Chalcedony
Cryptocrystalline Quartz (SiO2)
mineral
Caribbean Calcite
Calcite (CaCO3) with Aragonite (CaCO3)
mineral
Quartz (Pale Rose or Milky Variety)
Silicon Dioxide (SiO2)
mineral
Graphite
Graphite (C)
mineral
Chert (Jasper variation)
Microcrystalline Quartz (SiO2)
sedimentary
Iceland Spar (Optical Calcite)
Calcite (Calcium Carbonate, CaCO3)
mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral
White Chalcedony (Agate)
Silicon Dioxide (SiO2)
mineral
Aragonite (Flos Ferri)
Calcium Carbonate (CaCO3)
mineral
Quartz (Milky/Common)
Silicon Dioxide (SiO2)
mineral
Chert (or Chalcedony)
Microcrystalline Quartz (SiO2)
sedimentary
Carnelian Agate
Chalcedony (SiO2) with iron oxide inclusions
mineral
Chert (Flint)
Microcrystalline silica (SiO2)
sedimentary
Kyanite (Blue or Blue-Grey)
Kyanite (Al2SiO5)
metamorphic mineral
Druzy Quartz
Silicon Dioxide (SiO2)
mineral
Limonite (Ironstone)
Limonite (mixture of hydrated iron oxides, primarily Goethite α-FeO(OH))
mineral
Carnelian Agate
Silicon Dioxide (SiO2) with iron oxide impurities
mineral
Magnetite (Lodestone variety)
Magnetite (Fe3O4)
mineral
Agate Nodule / Weathered Chert
SiO2 (Silicon Dioxide - Microcrystalline Quartz)
Sedimentary / Mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Quartz (Milky Variant)
Silicon Dioxide (SiO2)
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Blue Apatite
Apatite (Group), Ca5(PO4)3(F,Cl,OH)
mineral
Halite (Rock Salt)
Halite (Sodium Chloride, NaCl)
mineral