Iron-rich rock or Concretion
Ironstone or Limonite concretion
Category
Browse sedimentary (chemical) specimens identified by the Rock Identifier community.
Iron-rich rock or Concretion
Ironstone or Limonite concretion
Orange Calcite
Calcium Carbonate (CaCO3)
Banded Chert
Microcrystalline Quartz (SiO2)
Limestone with Chert
Calcium Carbonate (CaCO3) with Silica (SiO2) inclusions
Quartz Pebble
Silicon Dioxide (SiO2)
Banded Chert
Silicon Dioxide (SiO2)
Concrete fragment with Aggregate
Anthropogenic Concrete with Calcarious and Siliceous Aggregate
Chert (Yellow Jasper variant)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
Chert nodules in Limestone
Microcrystalline Quartz (SiO2) in Calcium Carbonate (CaCO3) matrix
Banded Chert
Microcrystalline Quartz (SiO2)
Limonite (Ironstone Concretion)
Limonite (Hydrated iron(III) oxide-hydroxide, mixtures of FeO(OH)·nH2O)
Orange Calcite (Cleavage Rhomb)
Calcite (Calcium Carbonate, CaCO3)
Mudstone/Siltstone with Liesegang Bands
Argillaceous Sedimentary Rock with Chemical Banding
Travertine (Tufa)
Chemical Limestone (CaCO3)
White Quartz Beads
Silicon Dioxide (SiO2)
Chert (River Pebble)
Silicon Dioxide (SiO2)
Chert
Microcrystalline Silicon Dioxide (SiO2)
Calcite
Calcium Carbonate (CaCO3)
Yellow Calcite (Polished Pebble)
Calcium Carbonate (CaCO3)
Flint / Chert
Microcrystalline quartz (SiO2)
Chert or Chalcedony
Microcrystalline Quartz (SiO2)
Chert (with Liesegang Banding)
Microcrystalline quartz (SiO2)
Chert (specifically Zebra Chert/Flint)
Silicon Dioxide (SiO2)
Yellow Calcite
Calcium Carbonate (CaCO3)
Weathered quartz-rich pebble
Likely quartz aggregate, SiO₂, possibly quartzite or silicified rock
Fluorite, Turquoise, and Calcite set
Calcium Fluoride (CaF2), Hydrous Phosphate of Copper and Aluminum (CuAl6(PO4)4(OH)8·4H2O), Calcium Carbonate (CaCO3)
Milky quartz
Quartz (silicon dioxide, SiO₂)
Travertine (often colloquially called Tufa)
Chemical Sedimentary Calcium Carbonate (CaCO3)
Chert (Jasper/Flint variety)
Sedimentary silica (SiO2)
Chert (Flint Nodule)
Silicon Dioxide (SiO2)
Orange Calcite
Calcium Carbonate (CaCO3)
Chert (River Pebble)
Cryptocrystalline Quartz (SiO2)
Chert (Field Stone)
Microcrystalline Quartz (SiO2)
Chert / Flint
Microcrystalline Quartz (SiO2)
Chert (Flint)
Silicon Dioxide (SiO2)
Chert / Flint
Microcrystalline Quartz (SiO2)
Chert
Microcrystalline Quartz (SiO2)
Chert (often colloquially called Flint)
Microcrystalline or cryptocrystalline Quartz (SiO2)
Yellow Calcite
Calcium Carbonate (CaCO3)
Psilomelane (Black Hematite varietal)
Barium Manganese Oxide (Ba,H2O)2Mn5O10
Chert
Cryptocrystalline Quartz (SiO2)
Chert (Pebble)
Microcrystalline Quartz (SiO2)