Native Gold (in the form of jewelry)
Gold (Au)
mineral
Category
Sedimentary Or Metamorphic (Base Substrate)
Browse sedimentary or metamorphic (base substrate) specimens identified by the Rock Identifier community.
Learn about Sedimentary Or Metamorphic (Base Substrate) in the encyclopedia
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Limestone Cobble
Sedimentary Limestone (Calcium Carbonate, CaCO3)
sedimentary
Sapphire (likely blue synthetic sapphire or blue glass in a ring)
Corundum (Al₂O₃), specifically the blue variety due to trace amounts of iron and titanium impurities. If synthetic, it would still be Al₂O₃.
Mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Sandstone (with concrete/human-made layer)
Clastic Sedimentary Rock (primarily Quartz/Feldspar grains)
sedimentary
Pink Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone (Ferruginous)
Clastic sedimentary rock (primarily SiO2 with Fe2O3)
sedimentary
Moqui Marble
Ironstone Concretion (Goethite/Hematite)
sedimentary
Chalcedony Geode / Quartz Druzy
Silicon Dioxide (SiO2)
mineral
Leopard Skin Jasper
Jasper (Silicon Dioxide with impurities), SiO2
sedimentary
Green Aventurine
Aventurine Quartz (SiO2 with Fuchsite inclusions)
mineral
Unidentified Small Rock
Unknown
undetermined
Ferruginous Sandstone Pebble
Arenite with Iron Oxide matrix
sedimentary
Limestone (Micrite/Chalky variety)
Calcium Carbonate (CaCO3)
sedimentary
Bloodstone (Heliotrope)
Silicon Dioxide (SiO2) with Iron Oxide inclusions
sedimentary
Marble
Metamorphic rock composed of Recrystallized Carbonate Minerals (chiefly CaCO3)
metamorphic
Chert (specifically Yellow Jasper variety)
Silicon Dioxide (SiO2)
sedimentary
K2 Jasper (K2 Granite)
Azurite in Granite (Biotite Granite with Azurite inclusions)
igneous
Dalmatian Stone (Dalmatian Jasper)
Peralkaline Quartz-Feldspar Rock with Arfvedsonite
igneous
Ruby
Corundum (Al2O3 with Chromium trace impurities)
mineral
Ferruginous Sandstone (with Pyrite/Gold associations)
Ferruginous Arenite (SiO2 + Fe2O3)
sedimentary
Limestone (specifically Dolomitic/Crystalline Limestone)
Sedimentary Carbonate Rock (CaCO3 / CaMg(CO3)2)
sedimentary
Dark Agate / Chalcedony
Microcrystalline Quartz (SiO2)
sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with Goethite/Iron oxide inclusions
sedimentary
Asphalt Concrete (Bituminous Concrete)
Bituminous aggregate
sedimentary
Chert (Chert Nodule)
Microcrystalline quartz (SiO2)
sedimentary
Limestone Fragment
Sedimentary rock (primarily Calcium Carbonate, CaCO3)
sedimentary
Greenish Metamorphic Rock (likely containing epidote or chlorite)
Metamorphic rock, possibly epidosite or greenstone
Metamorphic
Graphite
Graphite (Carbon, C)
mineral
Sandstone (Limonitic/Arkose)
Sandstone (primarily SiO2 with FeO(OH)·nH2O)
sedimentary
Jasper (Iron-rich)
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) impurities
sedimentary
Schist (Micaceous Schist)
Micaceous schist (Mainly Muscovite/Biotite mixed with Quartz)
metamorphic
Schist
Mica Schist
metamorphic
Chert (specifically as a lithic artifact/projectile point)
Chert (Silicon dioxide, SiO2)
sedimentary
Chert (Red Jasper variant)
Microcrystalline Quartz (SiO2)
sedimentary
Jasper Agate (Carnelian Jasper)
Silicon Dioxide (SiO2) with iron oxide inclusions
mineral
Chert (Flint / Jasper)
Silicon Dioxide (SiO2)
sedimentary
Chert Pebble with Quartz Veining
Microcrystalline Quartz (SiO2)
sedimentary
Quartzite
Quartzite (primarily SiO2)
metamorphic
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Dendritic Chert
Silicon Dioxide with Manganese Oxide Inclusions (SiO2 + MnO2)
sedimentary
Sandstone (lithic/arkosic)
Clastic sedimentary rock (primarily SiO2)
sedimentary