Limonite Concretion
FeO(OH)·nH2O (Hydrated Iron Oxide)
Category
Browse mineral on sedimentary rock specimens identified by the Rock Identifier community.
Limonite Concretion
FeO(OH)·nH2O (Hydrated Iron Oxide)
Sandstone
Arenite (Sedimentary Rock)
Quartz Geode Fragment
Silicon Dioxide (SiO2)
Silty Shale
Silty Shale (Fissile Sedimentary Rock)
Sandstone and River Pebbles
Sedimentary Rock (Sandstone / Quartzite / Chert)
Sandstone
Clastic sedimentary rock (Quartz arenite or Arkose)
Sandstone
Quartzose Sandstone (Sedimentary Rock)
Shale (or Mudstone)
Laminose Mudrock (composition: clay minerals, quartz, and mica flakes)
Quartz Vein in Sedimentary Rock
Silicon Dioxide (SiO2) with host Chert or Limestone
Pyrite in Quartz Matrix
Iron Sulfide (FeS2) embedded in Silicon Dioxide (SiO2)
Druzy Quartz on Host Rock
Silicon Dioxide (SiO2)
Sandstone
Sedimentary rock composed mainly of quartz sand
Shale (with Iron Oxide staining)
Fissile Mudstone (primarily Quartz and Clay minerals)
Quartz-veined Sedimentary Rock
Hydrothermally veined Clastic Sedimentary Rock (SiO2 veins in Matrix)
Agated Chert
Microcrystalline Quartz (SiO2)
Sandstone (likely Greywacke or Lithic Sandstone)
Arenite / Wacke
Sandstone
Arenite
Sandstone (Water-worn pebble)
Arenite (primarily SiO2)
Sandstone (with Iron Staining)
Clastic Sedimentary Rock (primarily Quartz, SiO2)
Sandstone
Arenite (predominantly SiO2 quartz grains)
Fossilized Bone
Permineralized Vertebrate Bone
Sandstone
Clastic Sedimentary Rock
Agate
Silicon Dioxide (SiO2) - variety Chalcedony
Sandstone Pebble / Quartzite Pebble
SiO2 (Silicon Dioxide enriched sedimentary rock)
Chert with Quartz Veining
Microcrystalline Silica (SiO2)
Sandstone with Dendritic Inclusions
Quartzose Sandstone
Sandstone
Arenite (primarily SiO2)
Sandstone
Sandstone (composed predominantly of Quartz, SiO2)
Travertine
Calcium Carbonate (CaCO3)
Banded Agate with Drusy Quartz
Cryptocrystalline Quartz (SiO2) with macrocrystalline Quartz
Quartz-veined Sandstone
Sedimentary rock with quartz vein (SiO2)
Red Sandstone Pebble
Quartzose Sandstone
Hag Stone
Perforated sedimentary rock (typically sandstone or limestone)
Sandstone with Secondary Mineral Encrustation
Arenite with Silica/Calcite deposits (SiO2 or CaCO3)
Sandstone
Sedimentary Rock (Quartz arenite)
Sandstone (likely Arkosic or Lithic)
Clastic Sedimentary Rock (SiO2 with accessory minerals)
Sandstone with Quartz/Calcite druse
Arenite with druse (SiO2 or CaCO3)
Sandstone with Concretions / Liesegang Rings
Arenite with iron oxide banding
Sandstone
Arenite (clastic sedimentary rock)
Sandstone
Arenite (SiO2 based typically)
Seashell Fossil
Gastropoda fossil
Likely weathered iron-rich breccia or jasper
Silicified iron-oxide breccia; exact identification requires testing