Limestone
Calcium Carbonate (CaCO3)
Sedimentary
Category
Organic Specimen (Fossil)
Browse organic specimen (fossil) specimens identified by the Rock Identifier community.
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Sandstone
Arenite (SiO2 based)
sedimentary
Sandstone
Arenite (SiO2 based with various cements)
sedimentary
Limestone
Limestone (Calcium Carbonate - CaCO3)
sedimentary
Red Sandstone
Arenite (primarily Quartz, SiO2, with Iron Oxide cementing agent)
sedimentary
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone (Quartzose Sandstone)
Arenite (primarily SiO2)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Red Sandstone
Arenite (ferruginous sandstone)
sedimentary
Sandstone (Red Sandstone)
Arenite
sedimentary
Sandstone (Quartzose Sandstone)
Clastic sedimentary rock (SiO2 dominated)
sedimentary
Siltstone
Siltstone (composed of microscopic silt-sized particles of quartz and feldspar)
sedimentary
Red Sandstone
Clastic sedimentary rock (primarily SiO2 with Fe2O3)
sedimentary
Limestone
Sedimentary carbonate rock (CaCO3)
sedimentary
Ferruginous Sandstone
Sandstone (enriched with Iron Oxide)
sedimentary
Ironstone (with Limonite/Goethite)
Ferruginous Sedimentary Rock (contains Limonite FeO(OH)·nH2O and Hematite Fe2O3)
sedimentary
Stromatolite
Biogenic Sedimentary Rock (Lithified microbial mat)
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Pyrite
Iron Sulfide (FeS2)
mineral
Petoskey Stone (Fossilized Rugose Coral)
Hexagonaria percarinata
fossil
Petoskey Stone
Hexagonaria percarinata
fossil
Petoskey Stone
Hexagonaria percarinata
fossil
Petoskey Stone
Hexagonaria percarinata
fossil
Red Sandstone
Arenite (with Iron Oxide / Hematite cementation)
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Queen Conch Shell (Biogenic Calcium Carbonate)
Aliger gigas (synonym Strombus gigas); Composition: Aragonite (CaCO3)
mineral
Quartz Geode Fragment
Silicon Dioxide (SiO2)
mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Red Sandstone
Arenite
sedimentary
Petoskey Stone
Hexagonaria percarinata
fossil
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Boxwork Siderite or Sepatarian Nodule Weathering
Siderite (FeCO3) with secondary mineralization or Boxwork Geode fragment
sedimentary
Limonite Concretion (Goonie or Rattlestone)
Limonite (FeO(OH)·nH2O)
sedimentary
Jasper or Agate (Chalcedony)
Silicon Dioxide (SiO2) with impurities
sedimentary
Botryoidal Chalcedony
Silicon Dioxide (SiO2)
mineral
Fossiliferous Shale (with Vertebrate Bones)
Laminated Mudstone containing Fossilized Bone (Apatite)
sedimentary
Hematite Concretion
Iron oxide (Fe2O3) in concretionary form
sedimentary
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone
Arenite
sedimentary
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Hag Stone
Perforated sedimentary rock (typically limestone, sandstone, or flint)
sedimentary