Quartz Geode (with possible Manganese or Goethite coating)
Silicon Dioxide (SiO2)
Category
Browse sedimentary (primary) with artificial modification specimens identified by the Rock Identifier community.
Quartz Geode (with possible Manganese or Goethite coating)
Silicon Dioxide (SiO2)
Calcite
Calcium Carbonate (CaCO3)
Shale (with minor calcite veining)
Clastic sedimentary rock (primarily clay minerals and quartz)
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3 staining)
Hematite
Iron(III) oxide (Fe2O3)
Chert (Chalcedony/Flint)
Silicon Dioxide (SiO2)
Flint
Chert (Silicon dioxide, SiO2)
Quartz (Milky/Clear Fragment)
Silicon Dioxide (SiO2)
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
Biotite Mica
K(Mg, Fe)3AlSi3O10(F, OH)2
Quartz Pebble
Silicon Dioxide (SiO2)
Opal
Hydrated Silica (SiO2·nH2O)
Limonite (Iron Ore)
Hydrated Iron(III) Oxide-Hydroxide (FeO(OH)·nH2O)
Quartz Vein in Schist
Quartz (SiO2) in Pelitic Schist
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
Black Opal
Hydrated Silica (SiO2·nH2O)
Manganese Oxide Crust on Limestone
Manganese Oxides (e.g., Pyrolusite MnO2 or Romanechite) on CaCO3
Banded Iron Formation (BIF) / Ironstone Conglomerate
Ironstone (Hematite/Goethite rich sedimentary rock)
Chert (v. Flint)
Sedimentary Cryptocrystalline Quartz (SiO2)
Limestone with Calcite Veining
Sedimentary Calcium Carbonate (CaCO3)
Galena
Lead(II) Sulfide (PbS)
Celestite (Celestine)
Strontium sulfate (SrSO4)
Celestine (or Celestite) on Matrix
Celestine (SrSO4)
Magnetite (Iron Ore)
Magnetite (Fe3O4)
Chert Nodule (with Geode cavity)
Cryptocrystalline Quartz (SiO2)
Chert (Flint)
Microcrystalline Quartz (SiO2)
Quartz (Raw Chunk)
Silicon Dioxide (SiO2)
Quartz Vein in Host Rock (Breccia/Rhyolite)
Silicon Dioxide (SiO2) with matrix
Sandstone (Red Sandstone / River Stone)
Arenite (composed primarily of Quartz, SiO2, with Iron Oxide cementation)
Chert (Jasper variety)
Silicon Dioxide (SiO2)
Quartz
Silicon Dioxide (SiO2)
Bauxite (Aluminum Ore)
Hydrated aluminum oxides, primarily Al(OH)3, AlO(OH)
Limestone
Sedimentary Calcium Carbonate (CaCO3)
Limestone
Sedimentary Calcium Carbonate (CaCO3)
Agate
Cryptocrystalline Quartz (SiO2)
Limonite (Hydrated Iron Oxide / Bog Iron)
FeO(OH)·nH2O
Quartz Geode
Silicon Dioxide (SiO2)
Gypsum (Satin Spar variety)
Calcium Sulfate Dihydrate (CaSO4·2H2O)
Halite (Rock Salt)
Halite (NaCl)
Specular Hematite (on Schist/Matrix)
Hematite (Alpha-Fe2O3)
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
Calcite
Calcium Carbonate (CaCO3)