Chert Nodule
Microcrystalline Silica (SiO2)
Category
Browse mineral within sedimentary rock specimens identified by the Rock Identifier community.
Chert Nodule
Microcrystalline Silica (SiO2)
Sandstone (with Iron Siderite Concretion)
Arenite with Ironstone Concretion (FeCO3)
Ironstone Concretion
Siderite or Ferruginous Concretion (FeCO3 or Iron Oxides)
Turquoise
Hydrous phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)
Sandstone
Arenite (primarily SiO2)
Banded Sandstone
Arenite with Liesegang banding
Almandine Garnet in Schist
Almandine Garnet (Fe3Al2(SiO4)3) in Mica Schist
Quartz Geode (Cracked Open)
Quartz (Silicon Dioxide - SiO2)
Druzy Quartz on Matrix (likely Limestone or Sandstone)
Silicon Dioxide (SiO2) with various trace impurities
Chert (specifically Red Chert or Jasper)
Microcrystalline Quartz (SiO2)
Banded Sandstone (Zebra Stone)
Arenite with Iron Oxide Banding (Liesegang rings)
Sandstone (specifically Red Sandstone)
Arenite (primarily Quartz, SiO2)
Ironstone Concretion / Goethite-Hematite Nodule
Goethite/Hematite (α-FeO(OH) / Fe2O3)
Quartz (Druzy/Macro-crystalline)
Silicon Dioxide (SiO2)
Quartz Vein in Host Rock
Silicon Dioxide (SiO2) within Sedimentary or Igneous Matrix
Common Opal in Host Rock
Hydrated Silica (SiO2·nH2O)
Quartz Geode (likely within Limestone or Dolomite matrix)
Quartz (SiO₂)
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3 staining)
Sandstone (likely Graywacke or Arkose variant)
Clastic Sedimentary Rock (SiO2 with assorted lithic fragments)
Conglomerate (or Breccia)
Clastic Sedimentary Rock (Conglomeratic)
Sandstone
Arenite (primarily Quartz, SiO2)
Sandstone
Arenite (SiO2 primarily)
Sandstone Geode (Unbroken)
Siliciclastic sedimentary rock (primarily Quartz)
Sandstone (Ferruginous)
Arenite (with iron oxide cement)
Banded Sandstone (Liesegang Rings)
Sedimentary Arenite (SiO2 with FeO/Fe2O3 impurities)
Quartz Geode
Quartz (Silicon Dioxide - SiO2) within a Chalcedony and Limonite shell
Quartz (Druzy Quartz)
Silicon Dioxide (SiO2)
Clear Quartz (Druzy)
Crystalline Silicon Dioxide (SiO2)
Quartz Geode
Silicon Dioxide (SiO2)
Fancy Jasper (Ocean Jasper or River Jasper variant)
Silicon Dioxide with inclusions (SiO2)
Sandstone (River Pebble)
Arenite (primarily SiO2)
Ironstone (likely siderite or goethite-rich siltstone)
Ferruginous Siltstone
Chert (Chert / Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
Sandstone Concretion
Ferruginous Sandstone Concretion (Primarily SiO2 with Iron Oxide cement)
Sandstone Concretion
Clastic Sedimentary Concretion (primarily SiO2 with Fe2O3 cement)
Sandstone
Arenite (primarily SiO2 with various cementing agents)
Common Opal with Host Rock
Opal (Hydrated silica, SiO2·nH2O)
Limonite Concretion (Ironstone)
Limonite / Goethite (FeO(OH)·nH2O)
Sandstone (Ferruginous)
Arenite (Fe2O3 staining)
Limonite Concretion
Goethite-rich Concretion (FeO(OH))
Mica Schist
Crystalline Schist (often containing Muscovite, Biotite, and Quartz)
Quartz (Iron-stained)
Silicon Dioxide (SiO2)