Sandstone Pebble
Sandstone (Quartzose/Feldspathic Sandstone)
sedimentary
Category
Sedimentary Or Metamorphic (Base Substrate)
Browse sedimentary or metamorphic (base substrate) specimens identified by the Rock Identifier community.
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Ferruginous Sandstone
Arenite with Iron-oxide cement
sedimentary
Leopard Skin Jasper
Rhyolite (Silicon Dioxide with impurities), SiO2
igneous
Schist
Crystalline Metamorphic Rock (Schistose)
metamorphic
Quartz Vein in Host Rock (Gabbro or Basalt)
Silicon Dioxide (SiO2) with Mafic Silicates
metamorphic/igneous
Mica Schist
Muscovite/Biotite Schist
metamorphic
Sandstone
Arenite (SiO2 dominant)
sedimentary
Fossilized Brachiopod
Brachiopoda (e.g., Rhynchonellida or Spiriferida)
sedimentary
Silty Sand / Loam
Unconsolidated Clastic Sediment (Silicon Dioxide / Alumino-silicates mixture)
sedimentary
Sandstone (Ferruginous)
Arenite with Iron Oxide cement (primarily SiO2 with Fe2O3)
sedimentary
Limestone (Weathered Aggregate)
Sedimentary Carbonate Rock (CaCO3)
sedimentary
Coal (Anthracite / Bituminous)
Organic Sedimentary Rock (Carbon-based)
sedimentary
Bituminous Coal
Organic Sedimentary Rock (Carbon-based)
sedimentary
Chert Arrowhead
Microcrystalline Quartz (SiO2)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Mica
Muscovite / Biotite (Phyllosilicate group)
mineral
Mica Schist (Greenschist / Chlorite Schist)
Schist (rich in Muscovite, Chlorite, and Quartz)
metamorphic
Epidote in Quartz
Epidote (Ca2(Al,Fe)3(SiO4)3(OH)) in Quartz (SiO2)
mineral
Chert (River Siltstone/Quartzite)
Sedimentary Cryptocrystalline Quartz (SiO2)
sedimentary
Sandstone (with Moss/Lichen Growth)
Sandstone (Quartz Arenite / Lithic Arenite)
sedimentary
Druzy Quartz (on Chalcedony/Agate base)
Silicon Dioxide (SiO2)
mineral
Dragon Vein Agate
Chalcedony (cryptocrystalline Quartz), SiO2
mineral
Quartz with Mica Schist
Quartz-Mica Schist / Pegmatitic Quartz
metamorphic
Limestone Riprap
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Sandstone (Ferruginous)
Arenite (Fe-bearing Clastic Sedimentary Rock)
sedimentary
Sand Tiger Shark Tooth
Carcharias taurus (fossilized)
fossil
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Limonite/Goethite on Shale
Hydrous ferric oxides (FeO(OH)·nH2O) often associated with argillaceous rock
sedimentary
Quartz (specifically Milky Quartz or Quartzite)
Silicon Dioxide (SiO2)
mineral
Chalcedony (Botryoidal)
Silicon Dioxide (SiO2)
mineral
Schist
Mica Schist (predominantly Muscovite or Biotite)
metamorphic
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Fossilized Shark Tooth in Matrix
Otodus obliquus (Chondrichthyes: Lamniformes)
fossil
Apatite
Apatite group mineral (e.g., Fluorapatite - Ca5(PO4)3F, Chlorapatite - Ca5(PO4)3Cl, Hydroxylapatite - Ca5(PO4)3(OH))
mineral
Talc Schist / Soapstone
Talc (Mg3Si4O10(OH)2)
metamorphic
Sandstone Concretion
Clastic sedimentary rock (primarily Quartz SiO2 with mineral cement)
sedimentary
Sandstone (Ferruginous)
Arenite (with Iron Oxide)
sedimentary
Jasper Pendant
Chalcedony (Quartz) - SiO2
Mineral/Sedimentary
Limestone (Weathered / Limonite-stained)
Sedimentary carbonate rock (CaCO3)
sedimentary
Limestone
Sedimentary Rock (Primarily CaCO3)
sedimentary
Conglomerate
Clastic Sedimentary Rock (Conglomerate)
sedimentary
Conglomerate
Conglomerate (Clastic sedimentary rock)
sedimentary