Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Category
Sedimentary (Imitation)
Browse sedimentary (imitation) specimens identified by the Rock Identifier community.
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Botryoidal Pyrite
Iron Sulfide (FeS2)
mineral
Jasper (Red Jasper)
Silicon Dioxide (SiO₂)
sedimentary
Conglomerate (Red Sandstone variety)
Clastic Sedimentary Rock (Conglomeratic Sandstone)
sedimentary
Tumbled sandstone pebble
Quartz-rich sandstone, commonly subarkose or arkose
sedimentary
Banded Ironstone / Jasper Siltstone
Siltstone with Iron Oxide Hydrates (SiO2 with Fe2O3/FeO(OH))
sedimentary
Quartz-veined Siltstone
Siltstone with Quartz (SiO2) veins
sedimentary
Weathered Pyrite Nodule
Iron Sulfide (FeS2) undergoing oxidation to limonite/goethite
mineral
Dendritic Siltstone
Siltstone with Manganese Dendrites (MnO2)
sedimentary
Felsic gneiss, likely granitic gneiss
Quartz–feldspar–mica gneiss; commonly quartz + plagioclase/K-feldspar + biotite or hornblende
metamorphic
Granite
Felsic intrusive igneous rock
igneous
Banded Iron Formation
Banded Iron Formation (BIF)
sedimentary
Sandstone (Ferruginous)
Sandstone (primarily SiO2 with Iron Oxide cement)
sedimentary
Pyrite Nodules / Weathered Pyrite
Iron Sulfide (FeS2)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Red Jasper (with Chert/Quartz)
Silicon Dioxide (SiO2)
sedimentary
Jasper (likely Iron-stained)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Jasper
Silicon Dioxide (SiO2)
mineral
Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Picture Jasper
Silicon Dioxide (SiO2) with iron oxide and clay impurities
sedimentary
Orange Calcite (likely polished specimen)
Calcite
Mineral
Chert (Jasper variety)
Silicon Dioxide (SiO2)
sedimentary
Pyrite
Iron Disulfide (FeS2)
Mineral
Worn River Pebble with Fossil Indentation
Sedimentary Rock with Fossil Infill
sedimentary
Quartz Crystal
Silicon Dioxide (SiO2)
mineral
Jasper
Silicon Dioxide (Microcrystalline Quartz, SiO2)
sedimentary
Chert (Common Opal/Jasper variety)
Microcrystalline Quartz (SiO2) with hydration
sedimentary
Chalk / Sedimentary Limestone
Calcium Carbonate (CaCO3) - Biogenic Sedimentary Rock
sedimentary
Sedimentary Pebble (Sandstone)
Clastic Sedimentary Rock (SiO2 dominant)
sedimentary
Chalk (Sedimentary Limestone)
Calcium Carbonate (CaCO3) - Bioclastic Limestone
sedimentary
Iron-rich sandstone or laterite fragment
Ferruginous sandstone; possibly laterite/goethite-rich ironstone
sedimentary
Rounded river pebble
Indeterminate lithic clast; likely weathered sandstone or quartz-rich sedimentary rock
sedimentary
Banded sandstone pebble
Quartz-rich sandstone (predominantly quartz, with feldspar and iron-oxide cement)
sedimentary
Weathered quartz-bearing sandstone
Quartz arenite or feldspathic sandstone (tentative)
sedimentary
Sandstone
Clastic Sedimentary Rock
sedimentary
Sandstone
Clastic Sedimentary Rock
sedimentary
Sandstone
Clastic sedimentary rock
sedimentary
Sandstone
Clastic Sedimentary Rock
sedimentary
Sandstone
Clastic sedimentary rock
sedimentary
Sandstone
Clastic Sedimentary Rock
sedimentary
Argillite / Mudstone
Argillaceous sedimentary rock
sedimentary
Sandstone / Quartzite
Sedimentary quartz arenite
sedimentary