Quartz Geode (Cracked Open Fragment)
Silicon Dioxide (SiO2)
Category
Browse sedimentary or igneous fragment specimens identified by the Rock Identifier community.
Quartz Geode (Cracked Open Fragment)
Silicon Dioxide (SiO2)
Chert (Lithic flake / Arrowhead fragment)
Microcrystalline Quartz (SiO2)
Fluorite
Calcium fluoride (CaF2)
Sandstone nugget
Arenite (primarily Quartz SiO2)
Sandstone
Arenite (SiO2 with minor iron oxides)
Sandstone
Arenite (SiO2 variety)
Greywacke (likely)
Greywacke (a type of sandstone)
Grey Pebble (Sandstone / Quartzite Pebble)
Sedimentary rock (primarily Quartz - SiO2)
Limestone
Sedimentary rock composed mainly of calcite (CaCO3)
Sandstone
Clastic sedimentary rock (Quartz arenite)
River Rock
Silica-rich water-worn rock / Quartzite
Limestone
Sedimentary rock composed mainly of calcite (CaCO3)
Limestone with fossiliferous textures
Bioclastic Limestone (CaCO3)
Sandstone
Arenite
Sandstone
Arenite (SiO2 based)
Sandstone
Arenite
Sandstone
Arenite (SiO2 based)
Biotite Schist
Biotite Schist (K(Mg,Fe)3AlSi3O10(OH,F)2)
Sandstone (Quartzose)
Arenite (primarily SiO2)
Dalmatian Jasper
Aplite with Arfvedsonite inclusions
Sandstone
Arenite (SiO2 based)
Red Breccia Jasper
Silicon Dioxide (SiO2) with iron oxide impurities
Sandstone with Quartz Vein
Quartzose Sandstone with Hydrothermal Quartz
Sandstone Pebble
Sedimentary Rock (Quartzose Sandstone)
Sandstone
Sandstone (clastic sedimentary rock, predominantly SiO2)
Sandstone
Arenite (SiO2 primarily)
Sandstone
Arenite
Sandstone Pebble
Sedimentary Rock (Quartzose Sandstone)
Brecciated jasper (likely ocean jasper or rhyolitic jasper)
Silica-rich volcanic breccia composed mainly of microcrystalline quartz/chalcedony (SiO₂), with iron-oxide staining and possible feldspar
Granite Pebble
Granite
Quartz Druzy / Quartz Crystal Cluster
Silicon Dioxide (SiO2)
Sandstone
Clastic Sedimentary Rock
Sandstone
Clastic sedimentary rock
Uncertain polymict breccia or altered volcanic rock
Likely hydrothermally altered volcanic breccia; exact mineral identification requires testing
Iron Meteorite (likely Chondrite or weathered Iron-Nickel)
Meteorite (Fe-Ni alloy & silicates)
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3 cement)
Sandstone
Sandstone (SiO2-rich clastic sedimentary rock)
Fossiliferous Limestone
Calcium Carbonate - CaCO3
Sandstone
Arenite (composed primarily of SiO2)
Sandstone
Arenite (SiO2 based clastic rock)
Sandstone (Quartz-rich)
Arenite (primarily SiO2)
Sandstone
Arenite (primarily Quartz, SiO2)