Quartz
Silicon Dioxide (SiO2)
Category
Browse sedimentary (artificial) specimens identified by the Rock Identifier community.
Quartz
Silicon Dioxide (SiO2)
Jasper
Microcrystalline Quartz (SiO2)
Orange Calcite
Calcium Carbonate (CaCO3)
Pyrite
Iron Sulfide (FeS2)
Quartz-veined Sandstone Pebble
Quartzite-veined Arenite
Devil's Toenail
Gryphaea (extinct genus of foam oysters, typically composed of Calcite CaCO3)
Red Jasper
Silicon Dioxide (SiO2) with Iron impurities
Pyrite
Iron Sulfide (FeS2)
Blue Apatite
Apatite (Calcium Phosphate) - Ca5(PO4)3(F,Cl,OH)
Coal
Bituminous Coal / Anthracite
Limonite Geode (Ironstone Concretion)
Limonite [FeO(OH)·nH2O] with possible Quartz or Calcite interior
Sandstone Pebble
Quartz Sandstone
Jasper
Microcrystalline Quartz (SiO2)
Weathered limestone
Calcite-rich carbonate rock (mostly CaCO₃)
Fossilized shell fragment
Indeterminate fossil mollusk; likely a silicified or mineral-replaced bivalve/gastropod fragment
Red Sandstone
Quartz Arenite (iron-stained)
Sandstone / Weathered Quartzite
Sandstone (Quartz Arenite)
Sandstone
Arenite (Sedimentary rock composed of sand-sized grains, primarily SiO2)
Sandstone (Micaceous)
Arenite (composed primarily of SiO2)
Sandstone (Water-worn Pebble)
Clastic Sedimentary Rock (primarily SiO2)
Ironstone Pebble
Sedimentary Ironstone (Hematite/Limonite-bearing)
Coquina / Shelly Sandstone
Calcareous Sandstone / Coquina
Fossiliferous Sandstone (with Quartz patch)
Sedimentary Sandstone with Silicified Shell Fragments
Moqui Marble (Concretion)
Iron Oxide Concretion (Hematite-cemented Sandstone)
Sandstone (with Iron Oxide)
Quartz Arenite / Ferruginous Sandstone (SiO2 with Fe2O3)
Sandstone (with ripple marks)
Arenite / Quartz Sandstone
Jasper
SiO2
Limestone
Calcium Carbonate (CaCO3)
Sandstone (Pebble)
Sandstone
Sandstone and Conglomerate pebbles
Sedimentary clastic rock
Banded sandstone pebble
Lithic or quartz-rich sandstone; exact composition requires testing
Bivalve Seashell Fossil
Class Bivalvia
Quartz Geode in Sedimentary Host Rock
Silicon Dioxide (SiO2) in Carbonate Matrix
Quartz
Silicon Dioxide (SiO2)
Red Jasper and Hematite
Silicon Dioxide (SiO2) and Iron Oxide (Fe2O3)
Red Jasper or Ironstone concretion
SiO2 or Fe2O3
Aragonite Star Cluster (Cross-section)
Aragonite (Calcium Carbonate, CaCO3)
Blue Calcite
Calcium Carbonate (CaCO3)
Magnetite (Iron Ore)
Iron(II,III) oxide (Fe3O4)
Brown Jasper (Tumbled)
Silicon Dioxide (SiO2) with iron oxide inclusions
Pyrite
Iron Sulfide (FeS2)
Fluorite, Turquoise, and Calcite set
Calcium Fluoride (CaF2), Hydrous Phosphate of Copper and Aluminum (CuAl6(PO4)4(OH)8·4H2O), Calcium Carbonate (CaCO3)