River Rock
Sedimentary clast
sedimentary
Category
Mineral And Sedimentary
Browse mineral and sedimentary specimens identified by the Rock Identifier community.
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Copper Ore (Malachite and Limonite bearing)
Cuprite, Malachite, and Limonite mixture
mineral
Limonite (Iron Ore)
Hydrated Iron(III) Oxide-Hydroxide (FeO(OH)·nH2O)
mineral
Galena
Lead Sulfide (PbS)
mineral
Shale
Clastic Sedimentary Rock
sedimentary
Quartz with Inclusions
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite
sedimentary
Quartz (Rose Quartz or Jasper variety)
Silicon Dioxide (SiO2)
mineral
Limestone (or Sandstone)
Calcium Carbonate (CaCO3) / Silica (SiO2)
sedimentary
Fragmented Sedimentary Pebble
Clastic Sedimentary Specimen
sedimentary
Sandstone Concretion
Sedimentary concretion
Sedimentary
Limonite with Trace Fossils
Hydrous Iron Oxide Mixture (FeO(OH)·nH2O)
sedimentary
Blue Apatite
Calcium Fluorophosphate - Ca5(PO4)3F
mineral
Milky quartz crystal cluster
Quartz (silicon dioxide, SiO₂)
mineral
Limonite
Limonite (Hydrous iron oxides, predominantly Goethite FeO(OH)·nH2O)
mineral
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
mineral
Banded Sedimentary Rock
Stratified Siliciclastic / Arenite or Siltstone with Mineral Bands
sedimentary
Sandstone Pebble
Sandstone (SiO2 rich clastic rock)
sedimentary
Fossil oyster shell
Oyster (family Ostreidae), preserved as calcite/aragonite shell
fossil
Yellow Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Agate / Chalcedony Geode
Silicon Dioxide (SiO2)
sedimentary
Limonite
FeO(OH)•nH2O
mineral
Slate
Slate, a fine-grained metamorphic rock composed mainly of mica-group minerals and quartz
metamorphic
Red Jasper and Hematite
Silicon Dioxide (SiO2) and Iron Oxide (Fe2O3)
mineral
Fluorite, Turquoise, and Calcite set
Calcium Fluoride (CaF2), Hydrous Phosphate of Copper and Aluminum (CuAl6(PO4)4(OH)8·4H2O), Calcium Carbonate (CaCO3)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Manganese Ore (Psilomelane/Pyrolusite)
Psilomelane ((Ba,H2O)2Mn5O10) and Pyrolusite (MnO2)
Mineral
Quartz Geode
Silicon Dioxide (SiO2) in Host Rock
sedimentary
Felsic gneiss, likely granitic gneiss
Quartz–feldspar–mica gneiss; commonly quartz + plagioclase/K-feldspar + biotite or hornblende
metamorphic
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Shale
Shale (Lutite)
sedimentary
Quartz Geode with Calcite
Silicon Dioxide (SiO2) with Calcium Carbonate (CaCO3)
mineral
Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Sandstone Pebble
Sandstone (primarily Quartz, SiO2)
sedimentary
Galena with Pyrite
Lead Sulfide (PbS) associated with Iron Sulfide (FeS2)
mineral
Rough amber-like brown mineral specimen
Uncertain from photograph; possibly iron-stained quartz, common opal, or resinous amber
mineral
Yellow Apatite
Fluorapatite (Ca5(PO4)3(F,Cl,OH))
mineral
Quartz on Sandstone
Silicon Dioxide (SiO2) in Lithic Sandstone
sedimentary
Limonite / Ironstone Nodule
Limonite (Hydrated iron(III) oxide-hydroxide), FeO(OH)·nH2O
mineral
Sandstone Pebble
Arenite (Sandstone)
sedimentary
Sandstone (Ferruginous)
Arenite (with Iron Oxide cement)
sedimentary