Geode (unopened) or Calcareous Nodule
Siliceous or Calcareous Concretion/Nodule
Category
Browse mineral on sedimentary specimens identified by the Rock Identifier community.
Geode (unopened) or Calcareous Nodule
Siliceous or Calcareous Concretion/Nodule
Ironstone Concretion (Limonite/Goethite)
Ironstone (primarily FeO(OH)·nH2O)
Ironstone Concretion (Moqui Marble type)
Ferruginous Concretion (Fe2O3 / FeO(OH))
Tumbled Stone Collection (Fluorite, Sodalite, Moss Agate, Amethyst/Charoite, and Grey Agate)
Silica (SiO2) and Calcium Fluoride (CaF2) based minerals
Sedimentary rock with quartz veining
Laminated siltstone or mudstone with hydrothermal quartz veins
Sandstone (Red)
Arenite (Fe2O3 heavy)
Epidote with Magnetite/Hematite inclusions
Epidote (Ca2(Al2,Fe3+)(SiO4)3(OH)) with Iron Oxides
Green Jasper
Silicon Dioxide (SiO2) with mineral inclusions
Sandstone (Quartzite-rich)
Clastic Sedimentary Rock (primarily SiO2)
Sandstone
Clastic sedimentary rock (primarily SiO2)
Fluorite (Blue)
Calcium Fluoride (CaF2)
Ruby in Kyanite
Corundum in Disthene (Al2SiO5 + Al2O3)
Chalcedony on Matrix
Silicon Dioxide (SiO2)
Sandstone
Arenite (SiO2 primarily)
Almandine Garnet in Matrix
Almandine, Fe3Al2(SiO4)3
Carnelian (Chalcedony)
Silicon Dioxide (SiO2)
Amethyst Geode
Amethyst (Silicon Dioxide), Formula: SiO2
Schist
Chlorite/Mica Schist
Sparkling Druzy Quartz on Matrix
Silicon Dioxide (SiO2) with iron oxide inclusions
Pyrite
Pyrite (FeS₂)
Granite Gneiss
Granitic Gneiss
Pyrite
Iron Sulfide (FeS2)
Hematite (Iron Ore)
Hematite (Fe2O3)
Green Calcite
Calcium Carbonate (CaCO3)
Quartz / Common Opal Transition
Silicon Dioxide (SiO2)
Shale with Pyrite
Clastic sedimentary rock containing Iron Disulfide (FeS2)
Quartz Geode
Silicon Dioxide (SiO2)
Sandstone (Quartzite-rich)
Clastic sedimentary rock (primarily SiO2)
Sandstone (lithic wacke/arenite)
Clastic sedimentary rock (primarily SiO2)
Sandstone (likely Quartzose)
Arenite (SiO2 principal mineral)
Sulfur on matrix
Native Sulfur (S8)
Blue Apatite
Apatite (Calcium Phosphate) - Ca5(PO4)3(F,Cl,OH)
Limonite (Iron-rich Siltstone / Sandstone base)
Hydrous ferric oxide mixture (FeO(OH)·nH2O)
Limonite Pseudomorph after Pyrite
Limonite (Hydrous iron oxides e.g., FeO(OH)·nH2O) pseudomorphing Pyrite (FeS2)
Sandstone (likely Quartzose Sandstone with mineral staining)
Arenite (composed mainly of SiO2)
Sandstone
Clastic Sedimentary Rock (composed of SiO2 grains)
Sandstone
Arenite (composed primarily of SiO2)
Sandstone (Quartzose Sandstone)
Arenite (primarily SiO2)
Sandstone
Arenite
Sandstone (Banded)
Clastic Sedimentary Rock (composed of SiO2, CaCO3, or Fe2O3 cement)
Sandstone
Clastic sedimentary rock (primarily SiO2)
Gneiss
Gneiss