Yellow Chert (River Pebble)
Microcrystalline Quartz (SiO2)
sedimentary
Category
Anthropogenic Material (Man Made Rock)
Browse anthropogenic material (man made rock) specimens identified by the Rock Identifier community.
Mica Schist
Mica Schist (KAl2(AlSi3O10)(OH)2 / K(Mg,Fe)3AlSi3O10(OH)2)
metamorphic
Sandstone (Ferruginous)
Arenite with Iron Oxide cement
sedimentary
Chert (specifically Flint or Gray Chalcedony)
Microcrystalline Quartz (SiO2)
sedimentary
Quartzite
Quartzite (primarily SiO2)
metamorphic
Pink Quartzite
Quartzite (primarily SiO2)
metamorphic
Chert (also known as Flint or Common Chalcedony)
Cryptocrystalline Silica (SiO2)
sedimentary
Coquina
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Pebble (river rock/beach pebble)
Pebble (clast size class)
Sedimentary Rock
Sandstone
Quartz Arenite (a common type of sandstone, given the appearance), Arkose, Greywacke (depending on mineralogy)
Sedimentary Rock
Sandstone
Arenite (primarily SiO2)
sedimentary
Chert (Jasper/Flint variety)
Microcrystalline Quartz (SiO2)
sedimentary
Coquina Limestone (Fossiliferous Limestone)
Calcareous bioclastic sedimentary rock (CaCO3)
sedimentary
Anthracite Coal
Anthracite (Carbon-rich metamorphic rock)
metamorphic
Petrified Wood
Silicified Wood (SiO2)
metamorphic
Quartzite (River Pebble)
Quartzite (SiO2)
metamorphic
Granite
Granite
igneous
Chert (Cherty Flint/Jasper variety)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Schist with Quartz Veins
Schist with Quartz (SiO2)
metamorphic
Quartz (Gravel fragment)
Quartz (Silicon Dioxide, SiO2)
mineral
Quartzite Pebble
Quartzite (predominantly Silicon Dioxide - SiO2)
metamorphic
Ironstone with Limonite/Goethite coating
Ferruginous Sedimentary Rock (contains Limonite FeO(OH)·nH2O)
sedimentary
Granite Cobble (River Stone)
Felsic intrusive igneous rock (composition: Quartz, Feldspar, Mica)
igneous
Green Fluorite in Host Rock
Fluorite (Calcium Fluoride, CaF2)
mineral
Brecciated Jasper
Silicon Dioxide (SiO2) with varying mineral inclusions (Iron Oxide, Hematite, Clay)
sedimentary (clastic/chemical)
Diorite (Salt and Pepper Rock)
Diorite
igneous
Jasper (Red Jasper)
Silicon Dioxide (SiO₂)
sedimentary
Biotite (Mica)
Biotite group (K(Mg,Fe)3AlSi3O10(F,OH)2)
mineral
Chert (Nodule / Geode fragment)
Microcrystalline Quartz (SiO2)
sedimentary
Nuummite
Nuummite (Orthoamphibole rock composed of Anthophyllite and Gedrite)
metamorphic
Chert (Jasper and Chalcedony)
Silicon Dioxide (SiO2)
sedimentary
Red Jasper
Jasper (SiO2) with Hematite (Fe2O3) inclusions
sedimentary
Biotite Schist
Biotite Schist (K(Mg,Fe)3AlSi3O10(OH,F)2)
metamorphic
Mica Schist
Mica Schist (predominantly Muscovite or Biotite sheet silicates)
metamorphic
Milky Quartz (Water-worn Pebble)
Silicon Dioxide (SiO2)
mineral
Quartzite River Cobble
Quartzite (primarily SiO2)
metamorphic
Chert (Flint variety)
Chert (SiO2)
sedimentary
White Jade (Nephrite)
Nephrite, Ca2(Mg,Fe)5Si8O22(OH)2
Mineral
Petrified Wood
Silicified wood (Quartz/Chalcedony - SiO2)
sedimentary
Granite
Phaneritic Felsic Igneous Rock (primarily Quartz, Alkali Feldspar, and Plagioclase)
igneous
Chert (Flint)
Chert (SiO2)
sedimentary
Ferruginous Sandstone (Iron-rich Sandstone)
Ferruginous Arenite
sedimentary