Apatite
Ca5(PO4)3(F,Cl,OH)
Category
Browse sedimentary (man made conglomerate) specimens identified by the Rock Identifier community.
Apatite
Ca5(PO4)3(F,Cl,OH)
Sandstone
Arenite (SiO2 based)
Sandstone
Arenite (composed primarily of SiO2)
Sandstone
Arenite
Satin Spar Selenite
Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O
Common Opal / Chert
Hydrated silica (SiO2·nH2O) or Microcrystalline Quartz (SiO2)
Glauconitic Sandstone
Glauconitic Sandstone (Quartz with Glauconite)
Fossil Sponge / Horn Coral / Crinoid Stem
Phylum Porifera or Cnidaria fossilized in calcium carbonate / silica
Limestone (specifically Dolomitic/Crystalline Limestone)
Sedimentary Carbonate Rock (CaCO3 / CaMg(CO3)2)
Jasper, Agate, Quartz Mix (Polished Beads)
SiO₂ (Silicon Dioxide) for Quartz. Jasper and Agate are cryptocrystalline varieties of Quartz.
Chert (Sedimentary Rock)
Silicon Dioxide (SiO2)
Limestone Pebble
Sedimentary Calcium Carbonate (CaCO3)
Sandstone
Arenite
Sandstone
Arenite (SiO2 primarily)
Limestone with Fossil Fragments
Bioclastic Limestone (CaCO3)
Limestone
Sedimentary Calcium Carbonate (CaCO3)
Sandstone (likely Graywacke or Lithic Arenite)
Clastic sedimentary rock predominantly composed of silicate grains
Limestone (River Stone)
Calcium Carbonate (CaCO3)
Sandstone
Arenite (primarily SiO2)
Sandstone with Iron Staining
Arenite (SiO2 with FeO(OH) impurities)
Limestone (with possible Manganese oxide inclusions)
Sedimentary Calcium Carbonate (CaCO3)
Sandstone (Quartzose Sandstone)
Clastic Sedimentary Rock (primarily SiO2)
Limestone (specifically a Crushed Aggregate fragment)
Calcium Carbonate (CaCO3)
Sandstone (lithic wacke/arenite)
Clastic sedimentary rock (primarily SiO2)
Sandstone
Arenite (SiO2 based)
Limestone
Calcium Carbonate (CaCO3)
Sandstone (likely Graywacke or Arkose variant)
Clastic Sedimentary Rock (SiO2 based)
Sandstone
Arenite (SiO2 primarily)
Sandstone
Arenite (primarily SiO2)
Rounded river cobble, likely weathered sandstone or siltstone
Quartz-rich clastic sedimentary rock; exact identification requires a fresh surface and testing
Shale
Shale (Lutite)
Sandstone
Arenite (SiO2 based with various mineral cements)
Sandstone (Ferruginous)
Arenite (SiO2 with Fe2O3/FeO(OH) cement)
Sandstone (likely Graywacke or Lithic Sandstone)
Clastic Sedimentary Rock
Sandstone (with Siltstone/Greywacke variations)
Sedimentary Rock (Clastic)
Red Sandstone
Arenite (SiO2 with Fe2O3)
Sandstone (Red Arkose)
Sandstone (Arkose variant, primarily SiO2 with KAlSi3O8)
Hematitic Sandstone
Sandstone with Hematite inclusions (SiO2 + Fe2O3)
Red Jasper (or Agate/Jasper mixture)
Silicon Dioxide (SiO2) with Iron Oxide inclusions
Red Jasper
Silicon Dioxide (SiO2) with Hematite impurities
Chert (Agatized/Chalcedony variety)
Microcrystalline Quartz (SiO2)
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)