Quartz Geode
Silicon Dioxide (SiO2)
Category
Browse mineral on sedimentary rock specimens identified by the Rock Identifier community.
Quartz Geode
Silicon Dioxide (SiO2)
Sandstone
Sedimentary Clastic Rock (Quartz arenite)
Fossilized Bivalve Shell
Class Bivalvia (fossilized)
Sandstone (Ferruginous)
Arenite (primarily SiO2 with iron oxide cement)
River Pebble (Siltstone / Sandstone Pebble)
Sedimentary Rock (Quartz, Feldspar, Clay Minerals)
Fossil gastropod shell
Fossilized marine gastropod; exact genus/species cannot be determined from the image
Quartz Pebble
Silicon Dioxide (SiO2)
Flagstone
Sedimentary Sandstone / Flagstone
Shale
Mudrock / Fissile Shale
Sandstone
Arenite (SiO2 based)
Sandstone (with Calcite or Silica veins)
Clastic sedimentary rock (primarily SiO2)
Ironstone / iron-oxide-rich rock fragment
Likely limonite/goethite-rich ironstone; exact identification is not possible from the image alone
Vein-filled Sedimentary Rock
Silicified sedimentary rock with quartz/calcite vein
Sandstone (likely Ferruginous)
Arenite (primarily SiO2 with Fe2O3 staining)
Bumblebee Jasper
Anhydrous Calcium Carbonate with Sulfur and Arsenic (Orpiment/Realgar)
Sandstone (Fossiliferous)
Clastic Sedimentary Rock (primarily SiO2)
Sandstone
Clastic sedimentary rock (primarily SiO2)
Quartz Pebble
Silicon Dioxide (SiO2)
Sandstone (Quartzose)
Arenite (primarily SiO2)
Sandstone
Arenite (SiO2 based with various mineral cements)
Sandstone
Arenite (SiO2 primarily)
Druzy Quartz on Chalcedony Matrix
Silicon Dioxide (SiO2)
Chrysocolla on Matrix
Hydrated copper silicates ((Cu,Al)2H2Si2O5(OH)4·nH2O)
Weathered porphyritic volcanic rock (likely basaltic andesite)
Porphyritic basaltic andesite; mineral assemblage likely plagioclase, pyroxene, and iron oxides
Sandstone (Lithic Sandstone / Greywacke)
Sandstone (SiO2 rich clastic sedimentary rock)
Bauxite (Laterite Clay)
Bauxite (mixture of Hydrous Aluminum Oxides: Gibbsite Al(OH)3, Boehmite and Diaspore AlO(OH))
Fossilized Sea Urchin (Echinoid)
Echinoidea (Class) - likely replaced by Calcite or Quartz
Ironstone pebble
Ironstone (Ferruginous Sedimentary Rock)
Pebble / Sandstone / Siltstone
Sedimentary Rock (Quartz Sandstone / Siltstone)
Sandstone
Arenite (SiO2 based with cement)
Sandstone
Sandstone (SiO2 dominant)
Quartz Geode
Silicon Dioxide (SiO2)
Quartz Vein in Host Rock
Quartz (SiO2) in Mafic or Sedimentary Matrix
Sandstone
Arenite (primarily Quartz-rich)
Sandstone
Clastic sedimentary rock (primarily SiO2)
Green-gray stone pebble (not reliably identifiable from the image)
Undetermined; possibly a fine-grained sedimentary rock such as mudstone or siltstone
Sandstone / Chert Pebble
Silicon Dioxide / Sedimentary Rock (SiO2)
Sandstone
Clastic sedimentary rock (primarily SiO2)
Sandstone (Quartz Sandstone)
Arenite (primarily SiO2)
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
Raw Calcite
Calcium Carbonate (CaCO3)
Fossilized Bone Fragment
Vertebrate Fossil