Red Sandstone
Ferruginous Sandstone (SiO2 with Fe2O3)
Category
Browse sedimentary like (industrial composite) specimens identified by the Rock Identifier community.
Red Sandstone
Ferruginous Sandstone (SiO2 with Fe2O3)
Banded Chert
Microcrystalline Quartz (SiO2)
Anthracite Coal
Anthracite (Carbon-rich metamorphic coal)
Orange Calcite
Calcium Carbonate (CaCO3)
Sandstone (Ferruginous)
Arenite (composed primarily of SiO2 with Fe2O3 cement)
Bauxite
Bauxite (Al(OH)3, AlO(OH))
Sandstone (Yellow/Tan Sandstone)
Arenite (primarily Quartz, SiO2)
Limestone
Sedimentary rock composed primarily of calcium carbonate (CaCO3)
Gneiss (Cobble)
Gneiss
Marble
Recrystallized Calcite (CaCO3) or Dolomite (CaMg(CO3)2)
Sandstone
Arenite (SiO2 primarily)
Chert (Flint/Jasper)
Silicon Dioxide (SiO2)
Marble
Recrystallized Limestone (CaCO3)
Barite Rose
Barium Sulfate (BaSO4)
Limestone (Travertine/Tufa variant)
Calcium Carbonate (CaCO3)
Red Sandstone
Arenite (primarily Quartz with Hematite cement)
Chert (often called Jasper or Flint in this color variety)
Silicon Dioxide (SiO2)
Conglomerate
Clastic Sedimentary Rock (Conglomerate)
Ironstone (likely Limonite or Goethite)
Ferruginous sedimentary rock (FeO(OH)·nH2O)
Chert (Common Opal/Jasper variant)
Silicon Dioxide (SiO2)
Bauxite
Bauxite (Mixture of Al(OH)3, AlO(OH), and Fe2O3)
Carved Gemstone Mushroom
Quartz / Feldspar composite (Carved lapidary art)
Chert (Flint)
Chert (SiO2)
Sandstone (with Iron Staining)
Clastic Sedimentary Rock (primarily SiO2)
Green Calcite
Calcium Carbonate (CaCO3)
Chert (Iron-stained)
Chert (SiO2)
Quartz Geode
Silicon Dioxide (SiO2)
Sandstone (with Iron Staining)
Sandstone (mainly Quartz, SiO2, with Iron Oxides like Goethite/Hematite)
Bauxite
Aluminium ore consisting largely of the minerals gibbsite Al(OH)3, boehmite γ-AlO(OH) and diaspore α-AlO(OH)
Coal (Anthracite)
Anthracite coal (Carbon C)
Quartz Geode Fragment
Silicon Dioxide (SiO2)
Anthracite Coal
Anthracite
Bauxite
Hydrated Aluminum Oxides (primarily Gibbsite Al(OH)3, Boehmite γ-AlO(OH), and Diaspore α-AlO(OH))
Pink Satin Spar (Satin Spar Selenite Dyed)
Gypsum (CaSO4·2H2O)
Chalcedony (specifically Agate or Common Opal variety)
Cryptocrystalline Silica (SiO2)
Bituminous Coal
Humic coal (Carboniferous fossil fuel)
Oolitic Ironstone
Sedimentary Ooidal Ironstone (Limonite/Hematite mixture)
Yellow Chalcedony
Silicon Dioxide (SiO2)
Limestone
Calcium Carbonate (CaCO3)
Chert
Microcrystalline Quartz (SiO2)
Phyllite
Phyllite (regional metamorphic rock)
Glauconite Sandstone
Glauconitic Sandstone (K(Fe,Al)2(Si,Al)4O10(OH)2)