Banded Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Category
Not A Geological Specimen
Browse not a geological specimen specimens identified by the Rock Identifier community.
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Moqui Marble (Iron-Oxide Concretion)
Iron Oxide Concretion (Fe2O3)
sedimentary
Basalt
Extrusive mafic igneous rock
igneous
Crinoid Columnal Fossil in Chert
Crinoidea stemming section in Microcrystalline Quartz (SiO2)
fossil
Brain Coral Fossil
Family Mussidae or Merulinidae (Order Scleractinia)
sedimentary
Kimberlite
Kimberlite (Porphyritic Peridotite)
Igneous
Ironstone Concretion (Moqui Marble)
Iron-oxide Concretion (Hydrated ferric oxide, Fe2O3·nH2O)
sedimentary
Granitic Pegmatite
Granitic Pegmatite (principally Quartz, Potassium Feldspar, and Mica)
igneous
Metal Alloy (Jewelry)
Not a naturally occurring rock or mineral; likely a metal alloy for jewelry. Possible compositions include sterling silver (92.5% silver, 7.5% copper), or other silver/gold alloys.
Man-made Material (jewelry, metal alloy)
Limonite
FeO(OH)·nH2O (Hydrated iron oxide)
mineral
Carved Mottled Greenish-Yellow Crystal/Glass Object
Unknown; possibly a form of quartz (chalcedony/jadeite/nephrite) or glass/resin.
Man-made Object/Uncertain Mineral
Vesicular Basalt
Basalt (Mafic Extrusive Igneous Rock)
igneous
Septarian Nodule (Dragon Stone)
Septarian Concretion (CaCO3 + CaMg(CO3)2 + SiO2)
sedimentary
Chert (Jasper variety)
Silicon Dioxide (SiO2)
sedimentary
Chalcedony (Botryoidal)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Banded Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Basalt
Mafic volcanic rock (primarily plagioclase feldspar and pyroxene)
igneous
Moqui Marble (Iron Concretion)
Iron Oxide Concretion (Goethite/Hematite Cemented Sandstone)
sedimentary
Banded Iron Formation (Jaspillite)
Banded Iron Formation (BIF)
sedimentary
Limonite (Iron Ore)
Limonite (Hydrous iron(III) oxide-hydroxide mixture, FeO(OH)·nH2O)
mineral
Sandstone
Arenite (SiO2 based)
sedimentary
Ferruginous Sandstone (Ironstone)
Sandstone with Hematite/Goethite cement (SiO2 + FeO(OH))
sedimentary
Moqui Marble
Iron Oxide Concretion (Limonite/Hematite over Sandstone)
sedimentary
Moqui Marble (Shaman Stone)
Iron Oxide Concretion (composed primarily of Quartz sand with Hematite/Goethite shell)
sedimentary
Sandstone Concretion
Clastic Sedimentary Rock (primarily SiO2 with mineral cement)
sedimentary
Fordite
Anthropogenic paint-rock
mineraloid (human-made geological specimen)
Biotite (Mica)
Biotite group (K(Mg,Fe)3AlSi3O10(F,OH)2)
mineral
Green Glass Cullet / Recycled Glass
Amorphous Silicon Dioxide (SiO2) with various metal oxides
Man-made Glass (Not a natural rock or mineral)
Biotite Schist
Biotite-rich Schist
metamorphic
Basalt with Peridotite (Olivine) Xenolith
Olivine-rich Peridotite (Dunite) xenolith in Vesicular Basalt; chemical formula (Mg,Fe)2SiO4
igneous
Man-made Jewelry Charm (Enameled Metal)
Not a natural mineral; composed of base metal alloy (likely zinc or brass) and epoxy resin/enamel.
Synthetic / Manufactured Artifact
Jewelry Chain with Blue and Clear Gemstones (Likely Cubic Zirconia)
Cubic Zirconia (ZrO₂), Silver or White Gold/Platinum Alloy
Mineral (synthetic) and Metal (precious/base)
Jasper (specifically Chert/Ironstone)
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions
sedimentary
Smurf Rock (Fictional Interpretation)
Cyanus Anthropomorphicus (Geologic Simulation)
Artificial/Fantasy Object
Mica Schist
Schist (muscovite-biotite rich)
metamorphic
Man-made Crystal (Lead Glass)
Lead oxide-doped Silica Glass (approx. SiO2 + PbO)
Mineraloid/Synthetic Material
Opalite (Synthetic Moonstone/Opal)
Synthetic Silica Glass
mineraloid (synthetic)
Sandstone Moqui Marble (Concretion)
Iron oxide concretion (Hematite/Goethite and Quartz)
sedimentary
Ferruginous Sandstone
Arenite with Iron-Oxide cement (primarily Fe2O3 • nH2O)
sedimentary
Druzy Quartz on Chert/Siltstone
Silicon Dioxide (SiO2) on Microcrystalline Silica/Siltstone matrix
sedimentary
Gossan (Iron Hat) with Quartz and Chlorite
Limonite/Goethite-rich Gossan (FeO(OH)·nH2O) with inclusions of Quartz and Chlorite
Mineral/Metamorphic Substrate
Acrylic or Resin (Synthetic Imitation)
Polymethyl Methacrylate (PMMA) or Polyepoxide
Synthetic/Man-made Polymer