Septarian Nodule (Septarian Stone)
Septarian Concretion (CaCO3 with Siderite/Calcite/Aragonite)
sedimentary
Category
Sedimentary Rock (Specifically A Concretion Or Possibly A Geode)
Browse sedimentary rock (specifically a concretion or possibly a geode) specimens identified by the Rock Identifier community.
Moqui Marble (Ironstone Concretion)
Iron Oxide Concretion (Fe2O3 / FeO(OH))
sedimentary
Celestite (Celestine)
Strontium sulfate (SrSO4)
mineral
Thunderegg (Ate Agate/Jasper Geode)
Silicon Dioxide (SiO2) within Rhyolite/Perlite matrix
sedimentary/igneous intermediary
Amethyst (Rough Quartz)
Silicon Dioxide (SiO2) with iron impurities
mineral
Amethyst
Amethyst (SiO2 with iron impurities)
mineral
Amethyst
Amethyst (Silicon Dioxide, SiO2)
mineral
Greenschist
Greenschist (chlorite-epidote schist)
metamorphic
River Rock (River Cobbles)
Fluvial Conglomerate Clasts (primarily composed of various minerals such as Quartz, SiO2)
sedimentary
Note: Item is not a geological specimen
Guitar Components (Steel, Nickel, Plastic, Wood)
Synthetic/Consumer Product
Note: This is a Man-Made Object (Costume/Prop Patch)
Synthetic fiber and pigments (Cellulose/Plastic-based composite)
Non-geological
Sandstone Beach Pebble
Clastic sedimentary rock (SiO2 with iron oxide cement)
sedimentary
Ferruginous Sandstone with Ironstone Concretion
Goethite-rich Sandstone (FeO(OH))
sedimentary
Banded Gneiss
Gneiss (High-grade metamorphic rock typically composed of Quartz, Feldspar, and Mica)
metamorphic
Blue Chalcedony
Chalcedony (a cryptocrystalline variety of Quartz - SiO₂)
Mineral
Agate Geode
Chalcedony (SiO2 - Silicon Dioxide)
sedimentary (secondary mineral formation)
Ocean Jasper
Orbicular Jasper (variety of Chalcedony/Quartz, SiO2)
sedimentary
Pyrite on Limestone
Iron Disulfide (FeS2) in Calcium Carbonate (CaCO3) matrix
sedimentary (matrix) / mineral (inclusion)
Chalk (Calcitic)
Calcium Carbonate (CaCO3) - Biogenic Sedimentary Rock
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Chert (White-Tan variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
River Pebble Gravel
Hydrothermally modified Clastic Sediment (mainly Quartzite and Chert)
sedimentary
Chert (specifically Tan/Yellow Chert)
Chert (Microcrystalline or Cryptocrystalline Silica, SiO2)
sedimentary
Sandstone Pebble
Arenite (primarily SiO2)
sedimentary
Asphalt Concrete
Bituminous conglomerate
sedimentary
Marble
Recrystallized Calcite (CaCO3) or Dolomite (CaMg(CO3)2)
metamorphic
Chert (specifically Flint or Jasper variant)
Cryptocrystalline Quartz (SiO2)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Sandstone
Arenite (SiO2 based with various cements)
sedimentary
Jasper Agate (specifically Brecciated Jasper with Agate inclusions)
Silicon Dioxide (SiO2)
mineral
Amethyst
Amethyst (SiO2 with Iron impurities)
mineral
Red Jasper (possibly Orbicular)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Gneiss (specifically a Banded Gneiss cobble)
Gneiss (composed mainly of Quartz, Feldspar, and Biotite/Amphibole)
metamorphic
Red Jasper (possibly Wonderstone)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Amethyst Quartz (Amethyst Geode)
Silicon Dioxide (SiO2) with iron impurities
mineral
Amethyst
SiO2 (Silicon Dioxide)
mineral
Ruby (Pinkish-Red)
Corundum (Al2O3 with Chromium trace)
mineral
Ocean Jasper
Silicon Dioxide (SiO2) with various inclusions
Mineral (Variety of Quartz)
Sandstone (Ferruginous)
Ferruginous Sandstone (SiO2 with Fe2O3)
sedimentary
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic