Green Aventurine
Aventurine Quartz (SiO2 with Fuchsite inclusions)
mineral
Category
Sedimentary And Metamorphic Minerals
Browse sedimentary and metamorphic minerals specimens identified by the Rock Identifier community.
Amber / Copal
Succinite (fossilized tree resin)
mineraloid
Chert (Flint)
Silicon Dioxide (SiO2)
Sedimentary
Chert (with Limestone matrix)
Silicon dioxide (SiO2)
sedimentary
Sandstone (Ferruginous)
Arenite (Fe2O3 dominant staining)
sedimentary
Yellow Chert (Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Bauxite
Bauxite (Al(OH)3, γ-AlO(OH), and α-AlO(OH))
sedimentary
Ferruginous Sandstone (Ironstone)
Clastic sedimentary rock (SiO2 with Fe2O3/FeO(OH) cement)
sedimentary
Chert (and Petrified Wood)
Silicon Dioxide (SiO2)
sedimentary
Chert (Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Shale with Pyrite
Clastic sedimentary rock containing Iron Disulfide (FeS2)
sedimentary
Bay Scallop Shell
Argopecten irradians (Biogenic Calcium Carbonate / CaCO3)
sedimentary
Ammonite Fossil
Ammonoidea (subclass)
sedimentary
Moqui Marble (Concretion)
Iron oxide concretion (Goethite/Hematite and Sandstone)
sedimentary
Chert Nodule
Microcrystalline Silica (SiO2)
sedimentary
Fossilized Shark Tooth (Fragment)
Elasmobranchii fossil (likely Cretalamna or Squalicorax genus)
sedimentary
Chalcedony Geode
Chalcedony (SiO2) within a geode structure
Mineral Geode/Sedimentary or Volcanic related
Limonite (Iron Ore)
Limonite (Hydrated Iron Oxide, FeO(OH)·nH2O)
Mineral
Ironstone Concretion (Limonite/Goethite)
Ferruginous Sandstone / Ironstone (FeO(OH)·nH2O)
sedimentary
Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Chert (Chert Pebble)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Limonite Pseudomorph after Pyrite
Limonite (Hydrous iron oxides e.g., FeO(OH)·nH2O) pseudomorphing Pyrite (FeS2)
mineral
Quartz Crystal with Inclusions
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite
sedimentary
Jasper
Jasper (Silica-rich microcrystalline Quartz, SiO2 with Fe2O3 impurities)
sedimentary
Galena
Lead Sulfide (PbS)
mineral
Red Siltstone (or Red Shale)
Clastic Sedimentary Rock (Composition: primarily Quartz, Clay minerals, and Hematite Fe2O3)
sedimentary
Travertine (Tufa)
Chemical Sedimentary Limestone (CaCO3)
sedimentary
Honey Calcite
Calcium Carbonate (CaCO3)
mineral
Turquenite (Dyed Howlite)
Dyed Ca2B5SiO9(OH)5 (Calcium Borosilicate Hydroxide)
mineral
Calcite
Calcium Carbonate (CaCO3)
mineral
Quartzite with Iron Banding
Metamorphosed Quartz-rich Sandstone (SiO2 with Fe2O3 inclusions)
metamorphic
Chert (and/or Chalcedony)
Silicon dioxide (SiO2)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Jasper/Chalcedony)
Microcrystalline Quartz (SiO2)
sedimentary
Hematite
Iron (III) Oxide (Fe2O3)
mineral
Concretion or Geode (unbroken)
Varied (depending on mineral composition and cementing agent). For quartz-lined geodes, the scientific name of the dominant mineral would be Quartz (SiO2). For calcite-lined geodes, Calcite (CaCO3). Concretions are often composed of cryptocrystalline quartz (chert), calcite, or iron oxides.
Sedimentary rock (specifically a concretion or possibly a geode)
Sandstone (with Iron Oxide staining)
Arenite (primarily SiO2 with Fe2O3 staining)
sedimentary
Petrified Wood
Silicified Wood (primarily Chalcedony or Quartz, SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Petrified Wood (Calamites Fossil)
Calamites sp. (Silicified/Permineralized Plant Fossil)
sedimentary
Tufa (Limestone)
Calcareous Tufa (CaCO3)
sedimentary