Red Jasper (Polished)
Jasper (Iron-rich Microcrystalline Quartz, SiO2)
sedimentary
Category
Sedimentary
Browse sedimentary specimens identified by the Rock Identifier community.
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Geode (Chert or Quartz Nodule)
Silicon Dioxide (SiO2)
sedimentary
Chert (Chert Nodule with Chalky Cortex)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Halite (Rock Salt)
Halite (Sodium Chloride, NaCl)
mineral
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Orange Calcite (Cleavage Rhomb)
Calcite (Calcium Carbonate, CaCO3)
mineral
Manganese Ore (Psilomelane/Pyrolusite)
Psilomelane ((Ba,H2O)2Mn5O10) and Pyrolusite (MnO2)
Mineral
Yellow Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Green Opal
Hydrated Silica (SiO2·nH2O)
mineraloid
Fossil-bearing sedimentary rock, likely with a fossil shell or ammonite cross-section
Fossiliferous limestone or calcareous mudstone; fossil identity is uncertain from the image
fossil
Quartz Geode
Silicon Dioxide (SiO2) within a sedimentary or igneous host
sedimentary
Shale
Mudrock / Fissile Shale
sedimentary
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Pink sandstone pebble
Quartz-rich sandstone, likely arkosic or ferruginous sandstone
sedimentary
Weathered sandstone pebble
Sandstone, likely quartz-rich (arkose or quartz arenite)
sedimentary
Weathered gray sandstone or siltstone
Clastic sedimentary rock, likely quartz–feldspar-rich sandstone/siltstone
sedimentary
Weathered limestone
Calcite-rich carbonate rock (mostly CaCO₃)
sedimentary
Fossilized shell fragment
Indeterminate fossil mollusk; likely a silicified or mineral-replaced bivalve/gastropod fragment
fossil
Chert (Jasper)
Silicon Dioxide (SiO2)
sedimentary
Banded Sandstone (Zebra Stone)
Arenite with Iron Oxide Banding (Liesegang rings)
sedimentary
Sandstone with Ironstone Concretion
Arenite with Hematite/Goethite nodules (Fe2O3 / FeO(OH))
sedimentary
Chert (Jasper/Opaline variety)
Silicon Dioxide (SiO2)
sedimentary
Fossil Shell
Invertebrate fossil (Mollusca)
fossil
Rounded ironstone concretion
Iron-oxide-cemented sandstone or siltstone concretion, commonly hematite/goethite-bearing
sedimentary
Red sandstone
Quartz-rich sandstone, commonly ferruginous (Fe-oxide stained)
sedimentary
Weathered sandstone or siltstone
Clastic sedimentary rock, chiefly quartz and feldspar grains cemented by clay, silica, or iron oxides
sedimentary
Chert (Tan/Yellow variety)
Microcrystalline quartz (SiO2)
sedimentary
Shale (or Mudstone)
Clay mineral aggregate / Fine-grained siliciclastic sedimentary rock
sedimentary
Sandstone (Ferruginous)
Arenite with Iron Oxide (Fe2O3) cement
sedimentary
Painted Garden Rock
Coated Siltstone or Mudstone
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Hematite impurities
sedimentary
Caribbean Calcite
Calcium Carbonate with Argonite (CaCO3)
mineral
Yellow Jasper
Silicon Dioxide (SiO2) with iron oxide impurities
sedimentary
Chert / Flint
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Chert (Common Opal/Jasper transition)
Silicon Dioxide (SiO2)
sedimentary
Black Opal (Triplet)
Hydrated Silica (SiO2·nH2O)
mineral
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Fossiliferous Sandstone (with Quartz patch)
Sedimentary Sandstone with Silicified Shell Fragments
sedimentary
Fossilized Shell Fragment
Invertebrate marine fossil, likely calcium carbonate replacement
fossil
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Fossil Coral
Tabulate Coral (potentially Favosites or Calapoecia)
fossil
Gastropod Steinkern (Internal Mold Fossil)
Gastropoda (Class); Internal mold or 'Steinkern' composed of Calcium Carbonate (CaCO3) or Sedimentary matrix
sedimentary