Chert (Arrowhead)
Chert (primarily Microcrystalline Silica, SiO2)
sedimentary
Category
Sedimentary Rock (Specifically A Clastic Sedimentary Rock Formed Into A Cobble)
Browse sedimentary rock (specifically a clastic sedimentary rock formed into a cobble) specimens identified by the Rock Identifier community.
Breciated Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Conglomerate
Conglomerate (SiO2, Al2O3, Fe2O3, CaCo3)
sedimentary
Yellow Chert (Gold-colored River Pebble)
Microcrystalline Quartz (SiO2) with Limonite/Goethite staining
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Red Jasper (River Stone)
Jasper (Silicon Dioxide, SiO2 plus iron oxide inclusions)
sedimentary
Basalt with Mineral Vein (Cobble)
Basalt (with likely Quartz/Calcite vein)
Igneous
Quartz Crystal (specifically a Double-Terminated variety)
Silicon Dioxide (SiO2) - Low Quartz
mineral
Basalt River Cobble
Basalt (Mafic Extrusive Igneous Rock)
igneous
Quartz Vein in Sedimentary Rock
Silicon Dioxide (SiO2) with host Chert or Limestone
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Basalt with Vesicles
Aphanitic Mafic Volcanic Rock (Basalt)
igneous
River Basalt (Cobble)
Mafic Igneous Rock (Fine-grained Basalt)
Igneous
Quartzite
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Dalmation Stone
Peralkaline Rock (mixed silicate minerals)
igneous
Granite
Plutonic felsic igneous rock
igneous
Asphalt (Bituminous Pavement Bit)
Bitumen-bound aggregate (Petrochemical-bound composite)
sedimentary (anthropogenic/technogenic)
Red Quartzite Cobble
Quartzite (primarily SiO2)
metamorphic
Dalmation Stone (often called Dalmatian Jasper)
Peralkaline Rock (Microgranite/Aplite), SiO2 with inclusions of Arfvedsonite
igneous
Tiger's Iron
Pseudomorphic Quartz Aggregate (contains SiO2 with Fe2O3 and FeOOH)
metamorphic
Pink Quartzite
Quartzite (primarily SiO2 with trace impurities of iron oxides)
metamorphic
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Geode (Chert or Quartz Nodule)
Silicon Dioxide (SiO2)
sedimentary
Banded Agate
Chalcedony / Silicon Dioxide (SiO2)
mineral
Quartz Geode
Silicon Dioxide (SiO2) in Host Rock
sedimentary
Quartz (Chert/Chalcedony variety)
Silicon Dioxide (SiO2)
mineral
Granodiorite
Granodiorite (Intermediate intrusive igneous rock)
igneous
Basalt (River Stone)
Mafic volcanic rock
igneous
Yellow Quartzite (River Pebble)
Quartzite (primarily SiO2)
metamorphic
Shale
Laminated Mudstone
sedimentary
Druzy Quartz on Host Rock
Silicon Dioxide (SiO2)
mineral
Chert
Silicon dioxide (SiO2)
Sedimentary
Belemnoit (Fossil)
Belemnoidea (Order), Rostrum / Guard
sedimentary
Quartz (Chert/Chalcedony variety)
Silicon Dioxide (SiO2)
mineral
Basalt (Weathered/River worn)
Mafic Volcanic Rock (Primarily Plagioclase Feldspar and Pyroxene)
igneous
Fossiliferous Limestone
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Diabase (Dolerite) Cobble
Diabase / Dolerite
igneous
Iron-Stained Quartz (Riverside Cobble)
Silicon Dioxide (SiO2) with Limonite/Hematite inclusions
mineral
Moqui Marble (Shaman Stone)
Iron Oxide Concretion (Goethite/Hematite shell with Sandstone core)
sedimentary
Druzy Quartz on Matrix (likely Limestone or Sandstone)
Silicon Dioxide (SiO2) with various trace impurities
Mineral on Sedimentary Rock
Desert Rose
Gypsum (variety Selenite) - CaSO4·2H2O
mineral