Chert
Silicon dioxide (SiO2)
Sedimentary
Category
Antropogenic (Man Made Material)
Browse antropogenic (man made material) specimens identified by the Rock Identifier community.
Jade (Nephrite or Jadeite)
Nephrite: Ca2(Mg,Fe)5Si8O22(OH)2 (amphibole mineral); Jadeite: NaAlSi2O6 (pyroxene mineral)
Metamorphic Rock / Mineral
Basalt
Mafic Igneous Rock (composed primarily of Pyroxene and Plagioclase Feldspar)
Igneous
Ironstone with Pyrite
Ferruginous Sandstone (Fe2O3) with minor Sulfide minerals (FeS2)
sedimentary
Yellow Quartzite (Tumbled)
Quartzite (SiO2)
metamorphic
Conglomerate (River Rock)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone
Arenite
sedimentary
Orange Quartzite (River Pebble)
Quartzite (SiO2 with iron oxide impurities)
metamorphic
Diorite
Diorite (Intermediate intrusive igneous rock)
igneous
Chert (often called Flint in this variation)
Silicon dioxide (SiO2) - Microcrystalline quartz
sedimentary
Basalt
Aphanitic Mafic Igneous Rock
igneous
Diorite
Diorite (Intermediate intrusive igneous rock)
igneous
Quartzite
Quartzite (Primary mineral: SiO2)
metamorphic
Chert (Jasper/Agate variety)
Silicon Dioxide (SiO2)
sedimentary
Greenschist
Greenschist facies rock (containing chlorite, actinolite, albite, and epidote)
metamorphic
Coquina / Shelly Limestone
Bioclastic Limestone (composed of CaCO3)
sedimentary
Jasper (Red Jasper)
Silicon Dioxide (SiO₂)
sedimentary
Basalt (Water-worn pebble)
Basalt (Aphanitic mafic volcanic rock)
igneous
Quartzite Pebble
Quartzite (primarily SiO2)
metamorphic
Yellow Jasper
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Jasper
Quartz (SiO2) with impurities
sedimentary
Slag Glass
Glassy Silicate Residue
industrial byproduct
Basalt with Mineral Vein (Cobble)
Basalt (with likely Quartz/Calcite vein)
Igneous
Shale or Mudstone (Based on appearance)
Shale (fine-grained, laminated fissile sedimentary rock) / Mudstone (fine-grained, non-fissile sedimentary rock)
Sedimentary
Iolite (Cordierite)
Magnesium Iron Aluminum Silicate (Mg,Fe)2Al4Si5O18
mineral
Iron Meteorite
Iron-nickel alloy (primarily kamacite and taenite)
Meteorite (extraterrestrial material)
Quartzite
Quartzite (primarily SiO2)
metamorphic
Ruby (Pink to Red Corundum)
Al2O3 (Corundum with Chromium impurities)
mineral
Greywacke (River Pebble)
Greywacke sandstone with quartz veining
sedimentary
Turquoise
Turquoise (CuAl6(PO4)4(OH)8·4H2O)
mineral
Tiffany Stone
Bertrandite (Be4Si2O7(OH)2) mixed with Fluorite (CaF2), Opal, and Chalcedony
mineral
Diabase (Greenstone)
Diabase (also known as Dolerite)
igneous
Lapis Lazuli
Lapis Lazuli (Mineral composition: Lazurite (Na,Ca)8(AlSiO4)6(SO4,S,Cl,OH)2, Calcite, and Pyrite)
metamorphic
Chrysoprase (Nickel-bearing Chalcedony)
Silicon Dioxide (SiO2) with traces of Hydrous Nickel Silicates
mineral
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with iron oxide inclusions)
metamorphic
Almandine Garnet
Almandine (Fe3Al2(SiO4)3)
mineral
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals, (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4)
metamorphic
Petrified Wood
Silicified Wood (primarily SiO₂ - Silicon Dioxide)
metamorphic
Ironstone Concretion / Limonite Node
Ferruginous Sedimentary Rock (composed primarily of Limonite FeO(OH)·nH2O and Goethite)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Quartzite
Quartzite (primarily SiO2)
metamorphic
Petrified Wood
Silicified Wood (primarily SiO2 - Silicon Dioxide / Chalcedony)
metamorphic