Sandstone Pebble
Arenite (primarily SiO2)
sedimentary
Category
Sedimentary (Base), Then Artificial
Browse sedimentary (base), then artificial specimens identified by the Rock Identifier community.
Bloodstone (Heliotrope)
Silicon Dioxide (SiO2) with Iron Oxide inclusions
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Sandstone (likely Arkosic or Quartzose)
Sandstone (SiO2 with inclusions)
sedimentary
Gold Mineral
Native Gold (Au)
mineral
Limestone (with Calcite Veining)
Calcium Carbonate (CaCO3)
sedimentary
Sandstone (Ferruginous)
Arenite (complex silicate composition with iron oxides)
sedimentary
Sandstone (likely with Borings or Vesicular Basalt)
Clastic Sedimentary Rock (Sandstone)
sedimentary
Limestone (with Iron-Oxide staining)
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Chalcedony (Botryoidal)
Silicon Dioxide (SiO2)
mineral
Granite
Granite
igneous
Gneiss (with Quartz-Feldspar vein)
Gneiss (high-grade metamorphic rock) containing Quartz (SiO2) and Feldspar (KAlSi3O8 – NaAlSi3O8 – CaAl2Si2O8)
metamorphic
Fossil Crab
Decapoda (likely Avitelmessus or Raninidae family)
sedimentary
Anthracite Coal
Anthracite (Carbon-based sedimentary-metamorphic rock)
metamorphic
Sandstone
Clastic Sedimentary Rock (composed primarily of Quartz, SiO2)
sedimentary
Sandstone
Arenite (SiO2-rich)
sedimentary
Limestone
Calcite-rich Sedimentary Rock (CaCO3)
sedimentary
Chert (Nodule)
Silicon dioxide (SiO2) - Cryptocrystalline Quartz
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Jasper (specifically Bloodstone or Heliotrope variety)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary (chemically precipitated)
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Pyrite (on Quartz/Host Rock)
Iron Sulfide (FeS₂)
mineral
Fuchsite in Quartz
K(Al,Cr)2(AlSi3O10)(OH)2 (Muscovite with Chromium)
metamorphic
Fossilized Rugose Coral
Order Rugosa (Calcium Carbonate - CaCO3)
sedimentary
Heliotrope (Bloodstone)
Cryptocrystalline Quartz (SiO2) with inclusions of Hematite (Fe2O3)
mineral
Orbicular Jasper (Ocean Jasper variant)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Concrete rubble
Anthropogenic conglomerate
sedimentary
Graywacke
Graywacke Sandstone
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Limestone with fossil crinoid stems
Calcium Carbonate (CaCO3) containing Crinoidea fossils
sedimentary
Breccia
Breccia
sedimentary
Siltstone
Siltstone (primarily composed of microcrystalline Quartz and Feldspar)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Ferruginous Sandstone (Ironstone Conglomerate fragments)
Ferruginous clastic sedimentary rock (SiO2 cemented by Fe2O3)
sedimentary
Quartz-veined Sedimentary Rock
Hydrothermally veined Clastic Sedimentary Rock (SiO2 veins in Matrix)
sedimentary
Coral Rock (Coquina)
Biogenic Limestone (Calcium Carbonate - CaCO3)
sedimentary
River Stone / Siltstone
Siltstone (composed of lithified silt)
sedimentary
Liesegang Ring Siltstone
Siltstone with iron oxide Liesegang bands
sedimentary
Chert (Iron-stained)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Sandstone (Ferruginous)
Ferruginous Sandstone (SiO2 with Fe2O3/FeO(OH) cement)
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary