Chert (Nodule/Pebble)
Chert (Silicon Dioxide, SiO2)
sedimentary
Category
Industrial Byproduct (Anthropogenic Rock Like Material)
Browse industrial byproduct (anthropogenic rock like material) specimens identified by the Rock Identifier community.
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Quartz (milky quartz variety)
Quartz (SiO₂)
Mineral
Chalk / Sedimentary Limestone
Calcium Carbonate (CaCO3) - Biogenic Sedimentary Rock
sedimentary
Diorite
Intrusive Igneous Rock (Intermediate Composition)
igneous
Moissanite
Silicon Carbide (SiC)
mineral
Green Agate
Silicon Dioxide (SiO2) - Chalcedony variety
mineral
Milky Quartz in Conglomerate Matrix
Silicon Dioxide (SiO2) within Clastic Sedimentary Rock
sedimentary
Diorite (or Gabbro/Gneiss stream pebble)
Diorite
igneous
Chert (River Pebble)
Silicon Dioxide (SiO2)
sedimentary
Granite
Felsic intrusive igneous rock
igneous
Sandstone (Ferruginous)
Arenite (SiO2 with iron oxide impurities)
sedimentary
Chert (White/Gray variety)
Chert (SiO2)
sedimentary
Polished carnelian/chalcedony pebble
Microcrystalline quartz (SiO₂), likely iron-stained chalcedony
gemstone
Pegmatite (Quartz, Feldspar, and Tourmaline/Biotite)
Pegmatitic Igneous Rock
igneous
Basalt (Weathered)
Mafic Igneous Rock
igneous
Likely basalt pebble
Basalt; fine-grained mafic volcanic rock, chiefly plagioclase and pyroxene with possible olivine
igneous
Desert Rose
Selenite Rose (Gypsum: CaSO4·2H2O)
mineral
Breciated Limestone with Calcite Veins
Sedimentary Breccia (CaCO3)
sedimentary
Yellow Sapphire (Corundum)
Corundum (Aluminum Oxide, Al2O3)
mineral
Basalt (Vesicular)
Extrusive mafic igneous rock; primarily (Mg, Fe)2SiO4 (Olivine), CaAl2Si2O8 (Plagioclase Feldspar), and Pyroxene
igneous
Fuchsite Quartzite
Fuchsite-bearing Quartzite
Metamorphic
Limestone Pebble
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Serpentinite
Serpentinite (Mg, Fe, Ni)₃Si₂O―(OH)₄
metamorphic
Greywacke
Lithic Sandstone (Greywacke)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Banded Ironstone / Jasper Siltstone
Siltstone with Iron Oxide Hydrates (SiO2 with Fe2O3/FeO(OH))
sedimentary
Jasper Conglomerate
Polymictic Conglomerate (Quartz and Jasper clasts in a quartz-rich matrix)
sedimentary
Sandstone (Ferruginous)
Arenite (with Iron Oxide cement)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Quartz / Common Agate
Silicon Dioxide (SiO2)
mineral
Sandstone with Desert Varnish
Arenite with Ferromanganese patina
sedimentary
Variscite (or potentially a turquoise/variscite matrix cabochon, or an impression jasper)
AlPO4·2H2O (Variscite) or related phosphate/silicate material depending on exact composition
Mineral
Quartz with Iron Oxide
SiO2
mineral
Granitic Pegmatite with Schorl Tourmaline
Granitic Pegmatite (Schorl: NaFe3Al6(BO3)3Si6O18(OH)4)
igneous
Diamond
Carbon (C)
mineral
Bauxite
Alumina-rich rock (consisting of Gibbsite, Boehmite, and Diaspore)
sedimentary
Diorite
Diorite (Intermediate intrusive igneous rock)
igneous
Fossil scallop/bivalve shell
Fossilized pectinid bivalve; likely family Pectinidae (exact genus/species cannot be determined from the image)
fossil
Pumice
Vesicular Rhyolite or Dacite
igneous
Porphyritic Andesite (often called Chinese Writing Stone)
Porphyritic Basaltic Andesite with Feldspar Phenocrysts
igneous
Chert (specifically Yellow Jasper)
Sedimentary Cryptocrystalline Quartz (SiO2)
sedimentary