Sandstone (likely Quartz Sandstone)
Arenite (composed primarily of SiO2)
Category
Browse sedimentary (man made conglomerate) specimens identified by the Rock Identifier community.
Sandstone (likely Quartz Sandstone)
Arenite (composed primarily of SiO2)
Dalmation Stone (often called Dalmatian Jasper)
Peralkaline Rock (Microgranite/Aplite), SiO2 with inclusions of Arfvedsonite
Weathered limestone
Calcitic limestone, mainly calcium carbonate (CaCO₃)
Iron-stained chert or jasper pebble
Microcrystalline quartz (SiO₂), likely hematite/goethite-bearing
Quartz
Silicon Dioxide (SiO2)
Botryoidal Chalcedony
Silicon Dioxide (SiO2)
Calcite
Calcium Carbonate (CaCO3)
Blue Apatite
Apatite - Ca5(PO4)3(F,Cl,OH)
Pyrite
Iron Sulfide (FeS2)
Agate (Nodule/Chert)
Silicon Dioxide (SiO2)
Ironstone Concretion / Limonite
Goethite and Limonite (FeO(OH)·nH2O)
Agate (specifically, multi-colored or pastel-dyed agate)
Silicon dioxide (SiO2) - specifically, a cryptocrystalline variety of quartz known as Chalcedony, with banding classified as Agate. (If it were Fluorite, the chemical formula would be Calcium Fluoride - CaF2).
Sandstone
Arenite (SiO2 primarily)
Chert (Jasper variation)
Silicon dioxide (SiO2)
Chert (Yellow Jasper variant)
Microcrystalline Quartz (SiO2)
Fossiliferous Limestone
Calcium Carbonate (CaCO3) - Limestone
Painted Sandstone
Sandstone (clastic sedimentary rock) with acrylic/artistic coating
Banded Sandstone
Arenite with iron oxide banding
Red Sandstone (Iron-stained)
Clastic sedimentary rock (primarily Quartz with Iron Oxides)
Sandstone (Weathered Cobble)
Clastic Sedimentary Rock (primarily SiO2)
Sandstone
Arenite (SiO2 principal component)
Limestone
Calcium Carbonate (CaCO3)
Limestone
Calcium Carbonate (CaCO3)
Limestone with Calcite Veins
Calcium Carbonate (CaCO3)
Sandstone (Quartzite-rich)
Clastic Sedimentary Rock (primarily SiO2)
Quartz
SiO2
Red Jasper
Silicon Dioxide (Microcrystalline Quartz, SiO2)
Chert Nodules in Limestone / Fault Breccia
Silicon Dioxide (SiO2) in Calcium Carbonate (CaCO3) matrix
Dendritic Agate or Manganese Nodule in Chert/Limestone
Silicon Dioxide (SiO2) with Manganese Oxide (MnO2) inclusions
Red Jasper (River Stone)
Jasper (Silicon Dioxide, SiO2 plus iron oxide inclusions)
Blue Chalcedony
Chalcedony (cryptocrystalline Silicon Dioxide, SiO2)
Jasper with Purple Fluorite or Chalcedony
Silicon Dioxide (SiO2) with mineral inclusions
Fossiliferous Limestone
Calcium Carbonate (CaCO3) with organic fossil inclusions
Sandstone (Quartzose Sandstone)
Clastic Sedimentary Rock (primarily SiO2)
Sandstone (Ferruginous)
Arenite with Iron Oxide cement (SiO2 + Fe2O3)
Red Sandstone (Iron-Rich)
Arenite (Fe2O3)
Sandstone (Quartzite-rich Pebble)
Arenite (composed primarily of SiO2)
Sandstone (with Limonite staining)
Arenite (FeOx-rich)
Sandstone
Arenite (primarily SiO2 with various cementing agents)
Sandstone (likely Graywacke or Lithic Sandstone)
Arenite / Wacke (SiO2 based with lithic fragments)
Limestone
Calcium Carbonate (CaCO3)
Sandstone (Quartzose)
Arenite (SiO2 principal)