Category
Browse sedimentary (silicified fossiliferous chalcedony) specimens identified by the Rock Identifier community.
Tiger's Eye (commonly referred to as Blue/Gold Tiger's Eye)
Tiger's Eye is a variety of Chalcedony (cryptocrystalline quartz), SiO2, exhibiting chatoyancy. The blue variety is often called Hawk's Eye.
Sandstone
Arenite
Sandstone (Ferruginous)
Arenite (Fe-rich)
Chert (Flint)
Silicon Dioxide (SiO2)
Limonitic Iron Ore / Goethite
Hydrated Iron(III) oxide-hydroxide (primarily FeO(OH)·nH2O)
Limestone
Limestone (Calcium Carbonate - CaCO3)
Sandstone (lithic/greywacke variety)
Arenite (composed primarily of SiO2 with various lithic fragments)
Limestone
Calcium Carbonate (CaCO3)
Chert (Yellow/Tan Variety)
Chert (SiO2)
Sandstone (Quartzose)
Arenite (primarily SiO2)
Crushed Limestone (Gravel)
Calcium Carbonate (CaCO3)
Sandstone
Arenite (composed primarily of SiO2)
Sandstone (Quartz Arenite)
Sandstone (Chemical formula: primarily SiO2)
Sandstone (likely Quartzite-grade)
Arenite (primarily SiO2)
Sandstone
Arenite (composed primarily of SiO2, or Silicon Dioxide)
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3 staining)
Sandstone
Arenite (primarily SiO2)
Sandstone (Ferruginous)
Arenite (Fe-rich)
Sandstone (specifically Lithic or Quartz Arenite)
Arenite (composed primarily of SiO2)
Limestone
Calcium Carbonate (CaCO3)
Sandstone (with potential iron-oxide staining)
Arenite (primarily SiO2)
Sandstone
Arenite (primarily Quartz, SiO2)
Limestone
Calcium Carbonate (CaCO3)
Limestone (Brecciated/Recrystallized)
Calcium Carbonate (CaCO3)
Bauxite
Al2O3·2H2O (principally composed of gibbsite, boehmite, and diaspore)
Sandstone (with potentially metamorphic or basaltic bands)
Arenite / Lithic Wacke
Limestone (Grey and White specimens)
Calcium Carbonate (CaCO3)
Sandstone (specifically Flagstone)
Arenite (primarily composed of SiO2)
Sandstone (Ferruginous)
Arenite (primarily SiO2 with iron oxide cement)
Sandstone with Liesegang Rings
Arenite with Iron Oxide Concretions
Sandstone with Foliose Lichen
Arenite (Rock matrix) with Xanthoparmelia or Flavoparmelia (Lichen genus)
Pyrite
Iron Disulfide (FeS2)
Banded Jasper with Hematite or Quartz
Silicon Dioxide (SiO2) with impurities
Chert (Jasper variety)
Silicon Dioxide (SiO2)
Banded Chert or Chert with Quartz Veins
Chert (SiO2)
Quartz with Iron Stains
Quartz (SiO2) with iron oxide/hydroxide staining
Sandstone (Quartzose Sandstone)
Clastic sedimentary rock (SiO2 major component)
Sandstone (Quartzose)
Sandstone (clastic sedimentary rock, primarily SiO2)
Pyrite
Pyrite (FeS₂)
Bivalve Fossil (Clam/Mollusk)
Class: Bivalvia (Order: Veneroida), Calcium Carbonate (CaCO3)
Shale
Shale
Shale
Fissile Mudstone (primarily composed of clay minerals and quartz)
