Geode (Calcite or Quartz)
Silicon Dioxide (SiO2) or Calcium Carbonate (CaCO3)
Category
Browse mineral on sedimentary specimens identified by the Rock Identifier community.
Geode (Calcite or Quartz)
Silicon Dioxide (SiO2) or Calcium Carbonate (CaCO3)
Blue Chalcedony
Silicon Dioxide (SiO2)
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
Likely bituminous coal
Coal, predominantly carbon-rich organic matter with variable maceral and mineral content
Banded gneiss pebble
Gneiss, typically quartz–feldspar–mica assemblage
Gneiss
Foliated quartz–feldspar–mica gneiss
Pyrite in Quartz Matrix
Iron Sulfide (FeS2) embedded in Silicon Dioxide (SiO2)
Shale
Shale (Fine-grained clastic sedimentary rock)
Limonite
FeO(OH)·nH2O
Rainbow Fluorite
Fluorite (Calcium Fluoride, CaF2)
Sandstone
Arenite (SiO2 primarily)
Sandstone with Manganese Dendrites
Clastic Sedimentary Rock (SiO2 based with MnO2 inclusions)
Yellow Chalcedony / Carnelian
Silicon Dioxide (SiO2)
Sandstone
Clastic sedimentary rock (primarily SiO2)
Pyrite cluster (iron pyrite)
Pyrite, FeS₂
Shale
Sedimentary rock composed of clay minerals and quartz
Septarian Pebble
Septarian nodule / Concretion
Magnetite / Ironstone
Magnetite (Fe3O4)
Fluorite
Calcium Fluoride (CaF2)
Celestite
Celestine (SrSO4)
Hematite
Iron Oxide (Fe2O3)
Orange Calcite
Calcium Carbonate (CaCO3)
Fossilized Gastropod / Coral
Phylum Mollusca / Cnidaria (Silicified or Calcified)
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
Fluorite
Calcium Fluoride (CaF2)
Graphite
Graphite (Carbon, C)
Graphite
Carbon (C)
Limonite
FeO(OH)·n(H2O)
Limonite Geode / Ironstone Nodule
Hydrated Iron Oxide Hydroxide (FeO(OH)·nH2O)
Sandstone (lithic)
Lithic Wacke / Arenite
River Pebble (Siltstone / Fine-grained Sandstone)
Sedimentary Pebble (Siliclastic)
Sandstone with Mineral Veining or Crust
Sedimentary Sandstone (mostly SiO2 with Fe2O3 tinting)
Clear Quartz
Silicon Dioxide (SiO2)
Quartz
Silicon Dioxide (SiO2)
Quartz Mineral
Silicon Dioxide (SiO2)
Sandstone
Arenite (SiO2 based)
Chalcopyrite
Copper Iron Sulfide (CuFeS2)
Sandstone
Clastic Sedimentary Rock
Shale
Shale (claystone/mudstone)
Pyrite
Iron Pyrite (FeS2)
Pyrite
Iron Sulfide (FeS2)
Shale with Iron Staining
Fissile Mudrock (Sedimentary Rock)