Geode (Small unopened nodule)
Quartz-lined nodule (SiO2)
sedimentary
Category
Sedimentary Like (Industrial Composite)
Browse sedimentary like (industrial composite) specimens identified by the Rock Identifier community.
Learn about Sedimentary Like (Industrial Composite) in the encyclopedia
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Sandstone (with biological crust)
Arenite (SiO2 based)
sedimentary
Chert (Field Stone)
Microcrystalline Quartz (SiO2)
sedimentary
Satin Spar (often sold as Selenite)
Gypsum (Calcium Sulfate Dihydrate, CaSO4·2H2O)
mineral
Red Sandstone
Sandstone (lithic arenite or arkose with iron oxide)
sedimentary
Limonite / Ironstone
Limonite (Hydrated Iron Oxide) - FeO(OH)·nH2O
mineral
Chert (Nodule)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Limestone
Sedimentary Rock (Primarily CaCO3)
sedimentary
Greenish Metamorphic Rock (likely containing epidote or chlorite)
Metamorphic rock, possibly epidosite or greenstone
Metamorphic
Garnet Schist
Almandine Garnet Schist (Fe3Al2(SiO4)3 in Schistose matrix)
metamorphic
Sandstone (Quartzose Sandstone)
Clastic Sedimentary Rock (Lithic arenite / Quartz arenite)
sedimentary
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Ferruginous Conglomerate (or Iron-Rich Concrete/Slag)
Clastic Sedimentary (Silicon Dioxide/Iron Oxide matrix)
sedimentary
Ironstone (possibly Bog Iron or Limonite)
Goethite-rich Ironstone (FeO(OH))
sedimentary
Brick
Fired clay or Ceramic material (no specific mineralogical scientific name as it's a composite)
Man-made material (constructed)
Ironstone (with Limonite/Goethite)
Ferruginous Sedimentary Rock (contains Limonite FeO(OH)·nH2O and Hematite Fe2O3)
sedimentary
Blue Kyanite in Schist
Al2SiO5 in Mica Schist
metamorphic
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Sandstone
Arenite (SiO2 principal composition)
sedimentary
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Kaolinite (Kaolin)
Kaolinite (Al2Si2O5(OH)4)
mineral
Unakite
Altered Granite (Epidotized Granite)
metamorphic
Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Quartz Geode Fragment
Silicon Dioxide (SiO2)
mineral
Sandstone (Red/Brown)
Arenite (SiO2 dominated with iron oxides)
sedimentary
Sandstone
Sandstone (clastic sedimentary rock), primarily SiO2
sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Bauxite
Al2O3·2H2O (Aluminum Hydroxide)
sedimentary
Sandstone (Ferruginous)
Arenite (composed primarily of SiO2 with Fe2O3 cement)
sedimentary
Sandstone
Arenite (compositionally various, primarily SiO2)
sedimentary
Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Sandstone (Pebble)
Sandstone (SiO2 with iron oxide impurities)
sedimentary
Shale (Beach-worn)
Laminated Pelite (primarily clay minerals and quartz)
sedimentary
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Red Sandstone
Ferruginous Sandstone (SiO2 dominated with Fe2O3)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Asphalt Conglomerate
Artificial Bituminous Conglomerate
sedimentary
Sandstone
Arenite
sedimentary
Fossiliferous Limestone Pebble
Calcium Carbonate (CaCO3) with Biogenic Inclusions
sedimentary
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Garnet in Matrix
Almandine or Spessartine Garnet in Quartz/Schist Matrix (X3Al2(SiO4)3)
metamorphic