Granitoid (River Pebble)
Granite (primarily Quartz, Feldspar, and Mica)
igneous
Category
Industrial Byproduct (Often Confused With Igneous Rocks Or Meteorites)
Browse industrial byproduct (often confused with igneous rocks or meteorites) specimens identified by the Rock Identifier community.
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Agate
Agate (Microcrystalline Quartz, SiO2)
mineral
Grey Agate
Silicon Dioxide (SiO2) - Variety of Chalcedony
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Serpentinite
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4
metamorphic
Opalite (a synthetic glass, often confused with Opal)
Silicon dioxide glass (SiO2nH2O, for natural opal)
Synthetic (glass)
Quartz Geode Fragment
Silicon Dioxide (SiO2)
mineral
Chalcedony (Common Opal/Chert variety)
Silicon Dioxide (SiO2)
mineral
Crushed Stone (Gravel/Aggregates)
Crushed rock aggregate (varied composition including Granite, Limestone, and Quartz)
sedimentary and igneous (mixed)
Eudialyte
Na15Ca6Fe3Zr3Si(Si25O73)(O,OH,H2O)3(Cl,OH)2
mineral
Agate
Silicon dioxide (SiO2)
mineral
Gold Nugget
Native Gold (Au)
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Bituminous Coal
Bituminous coal (Lithotype: Durain/Clarain)
sedimentary
Pyrite
Iron Sulfide (FeS2)
mineral
Pyrite (Fool's Gold) in Matrix
Iron Disulfide (FeS2)
mineral
Ferruginous Sandstone (Gozzan-like)
Ferruginous Sandstone (SiO2 with FeO(OH) inclusions)
sedimentary
Pyrite (Iron Pyrite)
Iron Disulfide (FeS2)
mineral
Garnet
Garnet group species (likely Almandine, Fe3Al2(SiO4)3)
mineral
Sodalite
Na8(Al6Si6O24)Cl2
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Almandine Garnet
Almandine (Fe3Al2(SiO4)3)
mineral
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Smoky Quartz
Silicon Dioxide (SiO2)
gemstone
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral
Rose Quartz
Silicon Dioxide (SiO2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Banded Agate
Cryptocrystalline Quartz (SiO2)
sedimentary
Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Iolite (Cordierite)
Cordierite (Magnesium Aluminum Silicate), Mg2Al4Si5O18
Mineral
Granite Gneiss
Gneiss (Polymetamorphic Quartz-Feldspar-Mica rock)
metamorphic
Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Banded Agate
Chalcedony (Silicon Dioxide, SiO2)
mineral
Chromite
Chromite (FeCr2O4)
mineral
Emerald (Tumbled Beryl)
Beryllium Aluminum Silicate (Be3Al2Si6O18) with Chromium/Vanadium impurities
mineral
Concrete
Anthropogenic Sedimentary Conglomerate (Cement mixture: typically Ca2SiO4, Ca3SiO5, Ca3Al2O6)
sedimentary (artificial)
Amazonite
Amazonite (KAlSi3O8) - a variety of Microcline Feldspar
Mineral
Magnetite Nodule
Magnetite (Fe3O4)
mineral
Pyrite (Fools Gold)
Iron Sulfide (FeS2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Carnelian (Chalcedony)
Silicon Dioxide (SiO2)
mineral