Chert (varietal known as Jasper or Flint)
Silicon Dioxide (SiO2)
Sedimentary Rock
Category
Sedimentary Rock
Browse sedimentary rock specimens identified by the Rock Identifier community.
Chert (Flint)
SiO2 (predominantly microcrystalline or cryptocrystalline quartz)
Sedimentary rock
Sandstone
Arenite (general term for sandstone)
Sedimentary Rock
Red Jasper (beads)
Silicon Dioxide (SiO2) with iron inclusions
Sedimentary Rock
Chalk
Calcareous Ooze (composed primarily of coccoliths)
Sedimentary Rock
Coal (most likely Bituminous or Anthracite)
Bituminous Coal (Grade of Coal), Anthracite (Grade of Coal)
Sedimentary Rock
Banded Iron Formation (BIF)
Banded Iron Formation
Sedimentary Rock
Cherry Creek Jasper (also known as Red Creek Jasper or Cherry Creek Agate)
Jasper, microcrystalline quartz (SiO₂)
Sedimentary Rock
Coal (most likely Bituminous or Anthracite)
Coal (primarily composed of carbon with varying amounts of other elements)
Sedimentary rock
Ocean Jasper (Orbicular Jasper)
Silicon Dioxide (SiO2)
Sedimentary Rock
Red Jasper
Jasper (a cryptocrystalline variety of Quartz, SiO₂)
Sedimentary Rock
Jasper, possibly Brecciated Jasper or Ocean Jasper due to patterns and color
Silicon Dioxide (SiO2), a variety of Chalcedony
Sedimentary Rock
Chert (or possibly Flint)
SiO2 (Silicon Dioxide)
Sedimentary Rock
Banded Iron Formation
Banded Iron Formation (BIF)
Sedimentary Rock
Quartzite
Quartzite (primarily composed of SiO O₂)
Sedimentary Rock
Hag Stone
Porous sedimentary rock (typically Flint, Chert, or Sandstone) with naturally occurring holes
sedimentary
Pyrite in Shale
Iron Disulfide (FeS2)
mineral
Manganese Oxide Crust on Limestone
Manganese Oxides (e.g., Pyrolusite MnO2 or Romanechite) on CaCO3
sedimentary
Quartz (likely Herkimer Diamond style)
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (SiO2 dominant)
sedimentary
Ironstone Concretion / Limonite Node
Ferruginous Sedimentary Rock (composed primarily of Limonite FeO(OH)·nH2O and Goethite)
sedimentary
Ironstone (with Limonite/Goethite)
Ferruginous Sedimentary Rock (contains Limonite FeO(OH)·nH2O and Hematite Fe2O3)
sedimentary
Cockle Shell (Fossil or Recent)
Class Bivalvia, Family Cardiidae (e.g., Cerastoderma edule for common cockle)
Sedimentary (Biogenic, a type of fossil)
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Jasper Chert Nodules
Silicon Dioxide (SiO2) with Hematite impurities
sedimentary
Blue Chalcedony
Silicon Dioxide (SiO2)
mineral
Chert (Chalcedony/Agate variety)
Silicon Dioxide (SiO2)
sedimentary
Travertine
Calcareous Tufa / Travertine (CaCO3)
sedimentary
Geode (Unopened)
Siliceous Concretion / Geode
sedimentary
Chert (Agatized)
Silicon dioxide (SiO2)
sedimentary
Hematite Nodules (Moqui Marbles style)
Iron Oxide (Fe2O3)
mineral
Chert (Jasper)
Silicon Dioxide (SiO2)
sedimentary
Chert
Silicon dioxide (SiO2)
Sedimentary
Quartzite (Yellow/Orange variety)
Quartzite (primarily SiO2)
metamorphic
Quartz Vein in River Siltstone
Crystalline Quartz (SiO2) in Siliclastic Matrix
sedimentary
Geode with Quartz and possibly Jasper/Hematite
Quartz (SiO2) and Chalcedony (cryptocrystalline SiO2), possibly stained by iron oxides
Mineral/Sedimentary Geode
Chert (often called Flint in various colors)
Silicon Dioxide (SiO2)
sedimentary
Chert (Flint)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Chert / Flint
Microcrystalline or cryptocrystalline quartz (SiO2)
sedimentary
Chert (Common Opal/Jasper variety)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (specifically Tan/Gray Chert)
Microcrystalline quartz (SiO2)
sedimentary
Breciated Chert
Brecciated Chert (Microcrystalline Quartz, SiO2)
sedimentary