Granite Gneiss
Felsic Gneiss
metamorphic
Category
Industrial Byproduct (Anthropogenic Rock Like Material)
Browse industrial byproduct (anthropogenic rock like material) specimens identified by the Rock Identifier community.
Vesicular Basalt
Extrusive mafic igneous rock
igneous
Basalt with Vesicular Texture
Extrusive Mafic Igneous Rock (primarily Plagioclase Feldspar and Pyroxene)
igneous
Pumice
Pumice (a highly vesicular felsic volcanic rock)
igneous
Anthracite Coal
Anthracite (Carbon-based solid)
metamorphic
Fossilized Gastropod in Limestone
Gastropoda (Class) in Fossiliferous Limestone
sedimentary
Granite
Granite
igneous
Sugilite
Sugilite (KNa2(Fe,Mn,Al)2Li3Si12O30)
mineral
Pink Granite
Felsic Plutonic Rock (primarily Quartz, Potassium Feldspar, and Plagioclase)
igneous
Graphic Granite
Graphic Granite (a runic intergrowth of Quartz and Feldspar)
igneous
Chalcedony (specifically Blue Chalcedony or Common Opal variety)
Silicon Dioxide (SiO₂)
mineral
Quartz with Mica inclusions (likely Iron-stained)
Silicon Dioxide (SiO2) with Phyllosilicates
mineral
Coarse Sand or Fine Gravel
Detrital Sedimentary Fragments (mostly SiO2)
sedimentary
Brown Chert
Microcrystalline Quartz (SiO2)
sedimentary
Chert (varietal Flint)
Chert (SiO2)
sedimentary
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Chert
Microcrystalline Silicon Dioxide (SiO2)
sedimentary
Agate Geode
Silicon Dioxide (SiO2) - Chalcedony / Quartz Variety
Mineral
Native Copper
Native Copper (Cu)
mineral
Garnet
Almandine (Fe3Al2(SiO4)3) or Pyrope (Mg3Al2(SiO4)3)
mineral
Zircon
Zirconium Silicate (ZrSiO₄)
mineral
Snowflake Obsidian (or similar porphyritic volcanic rock)
Obsidian with Spherulites (if glassy), or Porphyritic Rhyolite/Andesite (if crystalline groundmass)
igneous
Serpentinite
Serpentinite (complex silicate minerals including lizardite, chrysotile, and antigorite)
metamorphic
Garnet (Almandine)
Almandine (Fe3Al2(SiO4)3)
mineral
Red Jasper
Silicon Dioxide (SiO2)
sedimentary
Almandine Garnet
Almandine (Fe3Al2(SiO4)3)
mineral
Mica Schist (with Muscovite)
Muscovite/Quartz Schist (KAl2(AlSi3O10)(OH)2)
metamorphic
Agate
Silicon Dioxide / Cryptocrystalline Quartz (SiO2)
mineral
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Iron Meteorite
Iron Meteorite (primarily Kamacite and Taenite, Fe-Ni alloys)
mineral
Milky Quartz with Iron Staining
Quartz (Silicon Dioxide, SiO2)
mineral
Coquina
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
White Zircon
Zircon (Zirconium silicate, ZrSiO4)
mineral
Jasper Conglomerate (Puddingstone)
Siliceous Conglomerate (Quartz and Jasper clasts in a fine-grained matrix)
sedimentary
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3/FeO(OH) cementing agents)
sedimentary
Milky Quartz with Country Rock contact
Silicon Dioxide (SiO2) in contact with Metamorphic/Igneous rock
mineral
Sandstone with Iron Banding
Arenite with Hematite or Limonite staining (SiO2 with Fe2O3)
sedimentary
Milky Quartz Mushroom Carving
Quartz (Silicon Dioxide, SiO2)
mineral
Slate
Foliated Metamorphic Rock (Mainly composed of Quartz, Illite, Chlorite)
metamorphic
Rough Agate/Chert Nodules
Cryptocrystalline Quartz (SiO2)
sedimentary
Opalite
Man-made opalescent glass (SiO2 + metal oxides)
mineral (synthetic)
Chert (Jasper variety)
Microcrystalline Quartz (SiO2)
sedimentary