Red Sandstone
Arenite (ferruginous sandstone)
sedimentary
Category
Sedimentary (Secondary Formation)
Browse sedimentary (secondary formation) specimens identified by the Rock Identifier community.
Druzy Quartz on Agate/Chert
Silicon Dioxide (SiO2)
mineral
Banded Agate (specifically Carnelian Agate)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
mineral
Chert (Jasper)
Silicon Dioxide (SiO2)
sedimentary
Chalcedony (specifically Agate or Carnelian variety)
Cryptocrystalline Silica (SiO2)
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Specular Hematite (Iron Ore)
Iron(III) oxide (Fe2O3)
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Carnelian Agate
Carnelian (Silicon Dioxide, SiO2)
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Green Aventurine (Green Quartzite)
Silicon Dioxide (SiO2) with inclusions of Fuchsite mica
metamorphic
Druzy Quartz on Host Rock
Silicon Dioxide (SiO2) with various iron-oxide inclusions
mineral
Puddingstone (Gowganda)
Jasper-clast Polymictic Conglomerate (Gowganda Formation)
sedimentary
Banded Iron Formation (BIF)
Magnetite-Hematite Chert (Banded Iron Formation)
sedimentary
Green Apophyllite and Stilbite on Quartz Cluster
Apophyllite-(K) (KCa4(Si8O20)(F,OH)·8H2O), Stilbite-Ca (NaCa4(Si27Al9)O72·28H2O), Quartz (SiO2)
Mineral
African Turquoise (Jasper)
Polychrome African Jasper (often marketed as 'African Turquoise' due to its color, but it is not true turquoise)
Rock
Sandstone
Arenite (SiO2 + various cementing minerals)
sedimentary
Sandstone (Ferruginous)
Sandstone (Clastic sedimentary rock, predominantly SiO2 with Fe2O3 cement)
sedimentary
Red Shale
Lutite (primarily composed of Hydrous Aluminum Silicates with Hematite staining)
sedimentary
Polygenetic Breccia
Clastic Breccia (containing lithic fragments in a fine-grained matrix)
sedimentary
Jasper
Silicon Dioxide (SiO2) - Impure Variety of Chert
sedimentary
Arkosic Sandstone (or Conglomeritic Sandstone fragment)
Arkose (rich in feldspar)
sedimentary
Sandstone (with Iron Staining)
Arenite (composed primarily of SiO2 with Fe2O3 staining)
sedimentary
Chert (Field-collected Arrowhead-shaped Fragment)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Optical Calcite (Iceland Spar)
Calcium Carbonate (CaCO3)
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Halite
Halite (Sodium Chloride, NaCl)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Quartz (Druzy/Macro-crystalline)
Silicon Dioxide (SiO2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Hematite with Magnetite
Iron Oxide (Fe2O3)
mineral
Quartz / Common Agate
Silicon Dioxide (SiO2)
mineral
Brown Agate
Silicon Dioxide (SiO2)
sedimentary
Pyrite
Iron Sulfide (FeS2)
mineral
Chert (Nodule)
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone Pebble (Quartzite-rich)
Clastic Terrigenous Sedimentary Rock (SiO2 dominant)
sedimentary
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
K2 Jasper (Beads)
Granodiorite with Azurite and Malachite
igneous
Quartz Geode
Silicon Dioxide (SiO2) in Geode form
sedimentary
Sandstone with trace fossil
Sandstone, possibly with Skolithos or similar trace fossil
sedimentary