Concretion
Calcareous/Siliceous Concretion
Category
Browse sedimentary or mineral specimens identified by the Rock Identifier community.
Concretion
Calcareous/Siliceous Concretion
Sandstone
Arenite
Magnetite
Magnetite (Fe3O4)
Sandstone
Arenite (composed primarily of SiO2)
Shale
Fissile Mudstone (primarily composed of phyllosilicate minerals like kaolinite, montmorillonite, and illite)
Dalmatian Jasper
Peralkaline rhyolite
Ironstone Concretion (Limonite/Goethite)
Iron-rich sedimentary rock (FeOx)
Milky Quartz in Conglomerate Matrix
Silicon Dioxide (SiO2) within Clastic Sedimentary Rock
Sandstone (Ferruginous)
Arenite (primarily SiO2 with iron oxide Fe2O3 cement)
Gneiss
Metamorphic rock of high-grade regional metamorphism
Sandstone
Arenite (primarily Quartz and Feldspar composition)
Sandstone
Arenite (SiO2 primarily)
Sandstone
Clastic Sedimentary Rock (composed primarily of Quartz, SiO2)
Sandstone (Weathered Pebble)
Arenite (primarily SiO2)
Sandstone (Quartzose)
Arenite (SiO2 based)
Sandstone
Arenite (SiO2-rich)
Sandstone (Ferruginous)
Arenite (with iron oxide cement, Fe2O3)
Shale
Fissile Mudstone (Shale)
Sandstone
Arenite (primarily SiO2)
Sandstone
Arenite (composed primarily of SiO2)
Chalcedony with Druzy Quartz Geode
Silicon Dioxide (SiO2)
Yellow Jasper
Silicon Dioxide (SiO2) with Goethite inclusions
Sandstone Concretion
Clastic Sedimentary Concretion (typically Quartz/Silica with Iron Oxide)
Yellow Chert (Yellow Jasper)
Microcrystalline Quartz (SiO2)
Biotite Schist with Garnet
Garnet-Biotite Schist
Jasper with Quartz Veins
Silicon Dioxide (SiO2) - Microcrystalline Quartz
Milky Quartz
Silicon Dioxide (SiO2)
Sandstone
Arenite (often composed of Quartz, SiO2)
Sandstone (with prominent jointing/fractures)
Arenite (composed primarily of SiO2)
Sandstone Beach Pebble
Clastic Sedimentary Rock (primarily Quartz with Iron Oxide coating)
Sandstone (with Lichen)
Arenite (primarily SiO2)
Sandstone (Graywacke)
Arenite / Graywacke (SiO2 with lithic fragments)
Red Sandstone
Arenite (Ferruginous Sandstone)
Banded Chert (likely Flint or Jasper variety)
Silicon Dioxide (SiO2)
Glauconitic Sandstone
Glauconitic Quartz Arenite (with K,Mg,Fe,Al silicate hydroxide)
Sandstone with Quartz Vein
Arenite with Quartz (SiO2) Infilling
Sandstone with Vitrinite/Coal inclusions
Arenite with Carbonaceous inclusions
Schist
Mica Schist (primarily Muscovite or Biotite sheet silicates)
River cobble (Greywacke/Sandstone)
Sandstone / Greywacke
Sandstone
Arenite (SiO2 based)
Pet Rock (Quartzite/Sandstone River Rock)
Silicon Dioxide (SiO2) mixture
Sandstone Pebble
Arenite (SiO2 based)