Chert (Pink Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Category
Not A Geological Specimen
Browse not a geological specimen specimens identified by the Rock Identifier community.
Milky Quartz (Gold-bearing Prospecting Specimen)
Silicon Dioxide (SiO2)
mineral
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Chipped Glass/Plastic Fragment
Silicon dioxide (SiO2) for glass (amorphous) or various polymer compounds for plastic
Man-made material (simulant/artifact)
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Banded Calcite (often commercially called 'Mexican Onyx')
Calcium Carbonate (CaCO3)
mineral
Chalcedony in Host Rock
Chalcedony (SiO2)
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Heulandite with Stilbite
Heulandite-Ca ((Ca,Na)2-3Al3(Al,Si)2Si13O36·12H2O) and Stilbite-Ca (NaCa4(Si27Al9)O72·28H2O)
mineral
Basalt
Basalt (dominated by Plagioclase Feldspar and Pyroxene)
igneous
Moqui Marble (Shaman Stone)
Ironstone Concretion (Fe2O3 with a sandstone core)
sedimentary
Schorl (Black Tourmaline)
Schorl (Sodium Iron Aluminum Borosilicate Hydroxide), NaFe3Al6(BO3)3Si6O18(OH)4
mineral
Petrified Wood
Silicified Wood (primarily SiO₂ / Silicon Dioxide)
mineral
Orbicular Granite
Orbicular Granidiorite / Plutonic Igneous Rock
igneous
Garnet-Mica Schist
Garnetiferous Porphyroblastic Schist
metamorphic
Native Gold Nugget
Native Gold (Au)
mineral
Portable Ceramic Space Heater
Polished Acrylonitrile Butadiene Styrene (ABS) Plastic with Ceramic Heating Elements
not a rock (synthetic/industrial object)
Honeycomb Coral Fossil
Favosites (extinct genus of tabulate coral)
sedimentary
Chalcedony in Limestone Host Rock
Silicon Dioxide (SiO2) within Calcium Carbonate (CaCO3)
Mineral within Sedimentary Rock
Quartz Geode
Silicon Dioxide (SiO2) within a secondary sedimentary structure
sedimentary
Septarian Nodule (Septaria)
Septarian Nodule (Calcium Carbonate/Aragonite/Calcite Concretion)
sedimentary
Sandstone (Ferruginous Concretion)
Ferruginous Sandstone Concretion / SiO2 with Fe2O3 cement
sedimentary
Metal Chain (Likely Steel or a Steel Alloy)
Steel (primarily iron and carbon); specific alloy unknown
Man-made Object (Metal/Alloy)
Limonite (Ironstone)
Limonite (Hydrated iron(III) oxide-hydroxide, FeO(OH)·nH2O)
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
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)
Moqui Marble (Iron-Oxide Concretion)
Iron Oxide Concretion (Fe2O3)
sedimentary
Basalt
Extrusive mafic igneous rock
igneous
Brain Coral Fossil
Family Mussidae or Merulinidae (Order Scleractinia)
sedimentary
Banded Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Ironstone Concretion (Moqui Marble)
Iron-oxide Concretion (Hydrated ferric oxide, Fe2O3·nH2O)
sedimentary
Granitic Pegmatite
Granitic Pegmatite (principally Quartz, Potassium Feldspar, and Mica)
igneous
Kimberlite
Kimberlite (Porphyritic Peridotite)
Igneous
Limonite
FeO(OH)·nH2O (Hydrated iron oxide)
mineral
Septarian Nodule (Dragon Stone)
Septarian Concretion (CaCO3 + CaMg(CO3)2 + SiO2)
sedimentary
Moqui Marble (Iron Concretion)
Iron Oxide Concretion (Goethite/Hematite Cemented Sandstone)
sedimentary
Basalt
Mafic volcanic rock (primarily plagioclase feldspar and pyroxene)
igneous
Chalcedony (Botryoidal)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
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)
One Pound Coin (UK)
Nickel-Brass Alloy (Cu-Zn-Ni)
mineral
Green Glass Cullet / Recycled Glass
Amorphous Silicon Dioxide (SiO2) with various metal oxides
Man-made Glass (Not a natural rock or mineral)
Moqui Marble
Iron Oxide Concretion (Limonite/Hematite over Sandstone)
sedimentary