Sandstone with Liesegang Rings
Arenite with Iron Oxide Liesegang Banding
sedimentary
Category
Mineraloid (Human Made Geological Specimen)
Browse mineraloid (human made geological specimen) specimens identified by the Rock Identifier community.
Quartz Geode
Silicon Dioxide (SiO2)
sedimentary
Gold Ore in Quartz/Matrix
Native Gold (Au) in Quartz (SiO2) matrix
mineral
Gold Ore (in Quartz/Sulfide matrix)
Native Gold (Au) in Quartz (SiO2) and Pyrite (FeS2)
mineral
Sandstone (with Iron Siderite Concretion)
Arenite with Ironstone Concretion (FeCO3)
sedimentary
Vesicular Basalt with Xenocrysts
Mafic Igneous Plutonic/Extrusive Complex
igneous
Devil's Toenail
Gryphaea (extinct genus of foam oysters, typically composed of Calcite CaCO3)
sedimentary
Geode (Unopened)
Silica-lined Vug (primarily SiO2)
sedimentary
Moqui Marble (Shaman Stone)
Ironstone Concretion (Fe2O3 - Hematite/Goethite shell with Sandstone core)
sedimentary
Banded Metamorphic Rock (likely Quartzite or Serpentinite/Soapstone)
Metamorphic Rock (possibly a banded Quartzite or a foliated Serpentinite/Talc Schist based on appearance, general term for such a rock is 'Banded Metamorphic Rock' or 'Gneiss' if pronounced banding of different minerals)
Metamorphic
Celestite (Celestine) Geode
Strontium Sulfate (SrSO4)
mineral
Slag (Anthropogenic Glass/Iron byproduct)
Ferro-silicate Slag
Anthropogenic (Man-made)
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Quartz (likely milky quartz or a stained variety)
Silicon Dioxide (SiO₂)
Mineral
Lunar Meteorite (Feldspathic Breccia)
Lunar Achondrite (Regolith Breccia)
igneous
Quartz (Milky/Clear Variety)
Silicon Dioxide (SiO2)
mineral
Petrified Wood
Silicified Wood (primarily SiO2 - Silicon Dioxide)
sedimentary
Sandstone (with Limonite staining)
Arenite (primarily SiO2 with FeO(OH)·nH2O)
sedimentary
Basalt with Epidote (Flowerstone-like texture)
Amygdaloidal Basalt (silicate mineral inclusions)
igneous
Fossil Brachiopod Cast (Atrypa species)
Phylum Brachiopoda, Class Rhynchonellata, Order Atrypida
sedimentary
Carnelian Agate
Silicon Dioxide (SiO2) with iron oxide impurities
mineral
Amygdaloidal Basalt
Amygdaloidal Basalt (Ca-rich Plagioclase, Pyroxene, and Olivine)
igneous
Amygdaloidal Rhyolite (often called Lake Superior Agate relative)
Rhyolite with Calcite/Quartz amygdules (SiO2 and secondary minerals)
igneous
Granite
Granite (Felsic intrusive igneous rock)
igneous
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Porphyritic Basalt (with Quartz or Calcite inclusion)
Porphyritic Basalt (Matrix: SiO2/MgO/FeO, Phenocryst: likely Quartz or Calcite)
igneous
Stromatolite
Biogenic Sedimentary Rock (composed predominantly of CaCO3)
sedimentary
Quartz Vein in Host Rock
Silicon Dioxide (SiO2)
mineral with metamorphic or sedimentary host
Petrified Wood
Silicified Wood (primarily SiO2 - Silicon Dioxide)
sedimentary
Ironstone Concretion (Moqui Marble)
Hematite/Goethite Concretion (Fe2O3 / FeO(OH))
sedimentary
Banded Iron Formation (BIF) / Iron Ore
Hematite-Magnetite BIF (Fe2O3 / Fe3O4 mixed with SiO2)
sedimentary
Dyed Agate Slice
Silicon Dioxide (SiO2) - variety of Chalcedony
mineral
Mica Schist (with Muscovite)
Muscovite/Quartz Schist (KAl2(AlSi3O10)(OH)2)
metamorphic
Quartz Vein in Host Rock
Silicon Dioxide (SiO2) within a metamorphic matrix
metamorphic
Pink Granite
Potassium Feldspar-Rich Granite
igneous
Granite
Granite (Felsic Plutonic Rock)
igneous
Liesegang Ring Siltstone
Siltstone with iron oxide Liesegang bands
sedimentary
Quartz Vein in Schist
Quartz (SiO2) in Mica Schist
metamorphic
Sandstone (Ferruginous)
Arenite (Iron-rich)
sedimentary
Jasper (yellow/cream variety)
SiO₂ (Cryptocrystalline Quartz)
Sedimentary
Greisen (Quartz-Muscovite-Turretine Rock)
Greisen
Metamorphic Rock
Granite (weathered/river-tumbled)
Granite (Plutonic Igneous Rock)
Igneous Rock