Red Sandstone
Arenite (Iron-rich)
Category
Browse sedimentary like (industrial composite) specimens identified by the Rock Identifier community.
Red Sandstone
Arenite (Iron-rich)
Sandstone
Arenite (SiO2 primarily)
Large calcite crystal cluster
Calcite (calcium carbonate, CaCO₃)
Gneiss
Gneiss
Quartz
Silicon Dioxide (SiO2)
Gneiss (Metamorphic Pebble)
Metamorphic Rock (Quartz-Feldspar-Biotite Gneiss)
Gneiss (Granulite / Foliated Metamorphic Rock)
Gneiss
Fluorite
Calcium Fluoride (CaF2)
Gneiss
Gneiss (Metamorphic rock composed primarily of Quartz, Feldspar, and Mica/Amphibole)
Gneiss
Gneiss (High-grade regional metamorphic rock)
Biotite Schist
Biotite Mica Schist [K(Mg,Fe)3AlSi3O10(OH,F)2]
Clear Quartz
Silicon Dioxide (SiO2)
Vesicular Basalt with Zeolite
Mafic volcanic rock with Hydrated Aluminosilicate minerals (Zeolite group)
Ferruginous Quartz
Silicon Dioxide (SiO2) with Limonite/Hematite inclusions
Stromatolite
Laminated biogenic sedimentary structure (Cyanobacteria)
Sandstone
Arenite (SiO2 based)
Garnet (specifically Almandine)
Almandine (Fe3Al2(SiO4)3)
Sandstone
Arenite (composed primarily of SiO2)
Druzy Quartz
Silicon Dioxide (SiO2)
Jasper
Silicon dioxide (SiO2)
Septarian Nodule with Calcite
Septarian Concretion (CaCO3 with internal calcite crystals)
Schorl (Black Tourmaline) in Pegmatite
Sodium Iron Aluminum Borosilicate (NaFe3Al6(BO3)3Si6O18(OH)4)
Sandstone (Quartzose Sandstone)
Clastic sedimentary rock (primarily SiO2)
Sandstone (likely Siltstone or fine-grained Sandstone)
Sedimentary Rock (Clastic)
Diamond
Native Carbon (C)
Limestone (Micritic)
Sedimentary rock mainly composed of Calcium Carbonate (CaCO3)
Precious Opal
Hydrated Silica (SiO2·nH2O)
Sandstone
Clastic Sedimentary Rock
Sandstone
Arenite (Sedimentary Rock)
Shale
Sedimentary rock composed of clay minerals and quartz
Conglomerate
Clastic sedimentary rock (Conglomerate)
Conglomerate
Conglomerate (clastic sedimentary rock)
Shale with Trace Fossils
Fissile mudrock (Shale)
Shale
Fissile mudstone (rich in clay minerals and quartz)
Anthracite Coal
Anthracite (Carbon-rich metamorphic coal)
Banded Chalcedony (Agate)
Cryptocrystalline Quartz (SiO2)
Orange Calcite (Carved as a Horned Skull)
Calcium Carbonate (CaCO3)
Quartz (Rock Crystal) with minor impurities
Quartz (SiO2)
Limestone
Calcium Carbonate (CaCO3)
Silver (Sterling Silver)
Argentum (Ag) mixed with Copper (Cu); Formula: Ag+Cu
Conglomerate
Conglomerate (clastic sedimentary rock)
Chert (Chocolate or Brown Flint)
Chert (SiO2)