Graywacke (Sandstone)
Graywacke 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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Coquina
Bioclastic Limestone (composed primarily of Calcium Carbonate / CaCO3)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Basalt and Quartz Pebble
Basalt (Igneous) and Quartzite/Quartz (SiO2) pebble
igneous and sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Magnetite (Lodestone)
Magnetite (Fe3O4)
mineral
Crushed Limestone and Calcite
Calcium Carbonate (CaCO3)
sedimentary
Basalt River Stone
Basalt
igneous
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Garnet
Garnet (X3Y2(SiO4)3)
mineral
Ironstone (likely Limonite or Goethite)
Ferruginous sedimentary rock (FeO(OH)·nH2O)
sedimentary
Slate
Metamorphic Mudstone / Shale
metamorphic
Sandstone Geode (Unbroken)
Siliciclastic sedimentary rock (primarily Quartz)
sedimentary
Conglomerate
Clastic sedimentary rock (Psephite)
sedimentary
Quartz (likely a form of massive or vein quartz)
Quartz (SiO₂)
Mineral
Mica Schist
Mica Schist (predominantly Muscovite/Biotite Schist)
metamorphic
Microcrystalline Limestone
Limestone (CaCO3 with impurities)
sedimentary
Biotite Schist
Metamorphic Rock (Schist)
metamorphic
Banded Gneiss Pebble
Gneiss (Metamorphic Rock)
metamorphic
Banded Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Granitic Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Siltstone
Siltstone (composed of mixed silicate minerals and clay)
sedimentary
Beryl (Variety Mix)
Be3Al2(Si6O18)
Mineral
Milky Quartz with Schist Matrix
Silicon Dioxide (SiO2) with Mica Schist Matrix
mineral
Magnetite (Lodestone)
Magnetite (Fe3O4)
mineral
Quartzite Pebble
Metamorphic Quartzite (SiO2)
metamorphic
Tree Agate
Chalcedony with Dendritic Chlorite (SiO2 with impurities)
sedimentary/mineral
Jasper with Hematite Inclusions
Silicon Dioxide (SiO2) with Ferric Oxide (Fe2O3)
sedimentary
Pyrite
Iron Disulfide (FeS2)
Mineral
Quartz pebble
Silicon dioxide (SiO2)
mineral
Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Botryoidal Pyrite
Iron Sulfide (FeS2)
mineral
Quartz (specifically Clear or Rose Quartz)
Silicon Dioxide (SiO2)
mineral
Limestone
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Quartz fragment (Pebble)
Silicon Dioxide (SiO2)
mineral