Ambergris
Ambergris (Coprolite-adjacent organic substance)
Organic (Geological interest)
Category
Organic (Geological Interest)
Browse organic (geological interest) specimens identified by the Rock Identifier community.
Kidney Stone
Nephrolithiasis (Calcium Oxalate, Hydroxyapatite, or Uric Acid)
mineral
Siderite Concretion in Shale
Iron carbonate (FeCO3) in Mudstone/Shale matrix
sedimentary
Unknown Rock Specimen
igneous
Petrified Wood
Silicified wood (primarily SiO2)
fossil
Banded Sedimentary Rock (Siltstone/Mudstone with concretion)
Siltstone with Ferruginous Banding
sedimentary
Chert (Nodule)
Chert (Cryptocrystalline Silica, SiO2)
sedimentary
Hardpan Nodule / Ferruginous Sandstone
Ferruginous Sandstone (Fe-cemented sediment)
sedimentary
Chert with Crinoid Fossil Impression
Microcrystalline Quartz (SiO2) with Crinoidea fossil impression
sedimentary
Chert (Jasper-like Silicate)
Microcrystalline quartz (SiO2)
sedimentary
Yellow Chert
Sedimentary cryptocrystalline quartz (SiO2)
sedimentary
Ironstone Concretion
Siderite or Goethite Concretion
sedimentary
Chert (Iron-stained)
Microcrystalline Quartz (SiO2)
sedimentary
Basalt with Quartz Vein
Extrusive Igneous Rock / Volcanic Rock
igneous
Cone-in-cone structure (Limestone)
Cone-in-cone structure (Secondary Sedimentary Structure)
sedimentary
Fossiliferous Sandstone / Quartzite Pebble
Sedimentary rock with skeletal fragments (e.g., Paleozoic crinoid/brachiopod fossils)
fossil
Tonsil Stone (Tonsillolith)
Calcium phosphate / Calcium carbonate biomineral
mineral
Gossanous Sandstone (likely Terrestrial)
Arenite with Iron-Oxide inclusions
sedimentary
Ferruginous Sandstone (Gozzan)
Iron-rich clastic sedimentary rock with Limonite/Goethite
sedimentary
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Sandstone Concretion
Ferruginous Sandstone Concretion
sedimentary
Sandstone with Iron Oxide Concretion
Arenite with Hematite/Goethite Concretion
sedimentary
Painted River Rock (likely Quartzite or Granite)
Quartzite or Granitic Gneiss (painted)
metamorphic
Banded Sedimentary Rock
Sedimentary rock with Liesegang banding
sedimentary
Fossiliferous Limestone
Limestone with embedded fossil cross-section
sedimentary
Concretion
Calcareous or ferruginous concretion
sedimentary
Coprolite
Fossilized Feces
fossil
Concrete Rubble with Aggregate
Hardened Portland Cement Paste with Coarse Aggregate
Anthropogenic (Man-made)
Ironstone Concretion
Ironstone (Limonite/Goethite Concretion)
sedimentary
Chert Nodule
Microcrystalline Quartz (SiO2)
sedimentary
Manganese Oxide Crust on Limestone
Manganese Oxides (e.g., Pyrolusite MnO2 or Romanechite) on CaCO3
sedimentary
Chert Concretion
Sedimentary Cryptocrystalline Quartz (SiO2)
sedimentary
Quartz-veined Sandstone Pebble
Quartzite-veined Arenite
sedimentary
Petoskey Stone
Hexagonaria percarinata (Fossilized Rugose Coral)
sedimentary
Moqui Marble / Ironstone Concretion
Ironstone Concretion (Goethite/Hematite and Sandstone)
sedimentary
Fulgurite
Fulgurite (Lechatelierite-rich fused silica)
mineraloid / sedimentary (secondary formation)
Quartz Vein in Siltstone
SiO2 (Quartz) on clastic sedimentary matrix
sedimentary
Gold Ore (in Quartz/Sulfide matrix)
Native Gold (Au) in Quartz (SiO2) and Pyrite (FeS2)
mineral
Sandstone with Trace Fossils
Arenite with Ichnofossils
sedimentary
Chert (specifically Cryptocrystalline Quartz)
Silicon dioxide (SiO2)
sedimentary
Ironstone Concretion (Limonite/Goethite)
Ironstone (composed primarily of Goethite FeO(OH) and Limonite)
sedimentary
Amygdaloidal Basalt
Basalt with secondary amygdule minerals (likely Epidote or Chlorite)
igneous