Ironstone Concretion (likely)
Goethite/Hematite/Limonite cemented sediment
Sedimentary Rock
Category
Sedimentary (With Some Aspects Of Mineral Replacement)
Browse sedimentary (with some aspects of mineral replacement) specimens identified by the Rock Identifier community.
Sandstone
Sandstone (lithified arenite/wacke)
Sedimentary Rock
Hag Stone (Piddock bored rock)
Calcareous sedimentary rock featuring Pholadidae borings
sedimentary
Greenstone / Glauconitic Siltstone
Metabasalt or Glauconite-rich Sedimentary Rock
metamorphic or sedimentary
Zircon
Zircon (ZrSiO4)
Mineral
Hematite Beads
Hematite (Fe2O3)
Mineral
Petoskey Stone
Hexagonaria percarinata (Fossilized Coral)
sedimentary
Sodalite
Na8(Al6Si6O24)Cl2 (Sodium Aluminum Silicate Chloride)
mineral
Sandstone (likely Ferruginous)
Arenite (SiO2 based with Fe2O3/FeO(OH) cement)
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Hematite impurities
sedimentary
Travertine (Calcareous Tufa)
Calcium Carbonate (CaCO3)
sedimentary
Fossilized Echinoid (Sea Urchin)
Echinoidea (Class), often found as calcitic fossils
sedimentary
Gneiss (specifically a granitic gneiss cobble)
Gneiss (high-grade regional metamorphic rock)
metamorphic
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Chert (Flint variety)
Chert (Cryptocrystalline Quartz, SiO2)
sedimentary
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Amber (specifically Red or Cherry Amber)
Succinite (Resinite); Chemical formula: C10H16O
Mineraloid
Muscovite Mica
Muscovite (KAl₂(AlSi₃O₁₀)(F,OH)₂))
Mineral
Peridot
Olivine (Mg,Fe)2SiO4
Mineral
Rhodonite
Rhodonite (Manganese Silicate), (Mn,Fe,Mg,Ca)SiO3
mineral
Quartz (likely) / Siliceous rock with quartz phenocrysts (if a rock fragment)
Quartz (SiO₂)
Mineral
Chert (Jasper variety)
Microcrystalline Quartz (SiO2)
sedimentary
Fossilized Turritella Gastropod (Internal Mold)
Turritella (Fossil Gastropod Crust)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Bituminous Coal
Organic Sedimentary Rock (Carbon-based)
sedimentary
Kambaba Jasper (Crocodile Jasper)
Stromatolite (Fossilized Algae within Microcrystalline Quartz), SiO2
sedimentary
Stromatolite
Cyanobacteria fossilized formation (CaCO3)
sedimentary
Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Almandine Garnet
Iron aluminum silicate - Fe3Al2(SiO4)3
metamorphic
Amber (Copal)
Organic gemstone, fossilized tree resin (often immature amber or copal)
Mineral
Chert (Hagstone/Gasket Rock variant)
Chert (SiO2)
sedimentary
Kunzite (variety of Spodumene)
Lithium Aluminum Silicate (LiAlSi2O6)
mineral
Amber
Succinite (specifically for Baltic amber; fossilized tree resin)
Organic (Sedimentary-associated)
Conglomerate
Conglomerate (Clastic sedimentary rock)
sedimentary
Pink Sapphire
Corundum (Al2O3) with Chromium/Iron/Titanium trace impurities
mineral
Gneiss (High-Grade Metamorphic Rock)
Gneiss (primarily composed of Quartz, Feldspar, and Mica/Amphiboles)
metamorphic
Hypersthene
Hypersthene (Magnesium Iron Silicate - (Mg,Fe)SiO3)
mineral
Banded Chert
Microcrystalline Quartz (SiO2)
sedimentary
Red Jasper (Chert)
Silicon dioxide (SiO2) with iron oxide inclusions
sedimentary
Green Chert
Microcrystalline Quartz (SiO2)
sedimentary
Jasper with Hematite (Red Jasper)
Silicon Dioxide with Iron Oxide (SiO2 and Fe2O3)
sedimentary (physico-chemical precipitate)
Red Jasper
Jasper (Silicon Dioxide) - SiO2
sedimentary