Limestone
Calcium Carbonate (CaCO3)
Category
Browse sedimentary (microcrystalline silicate) specimens identified by the Rock Identifier community.
Limestone
Calcium Carbonate (CaCO3)
Heliotrope (Bloodstone)
Chalcedony quartz variety (SiO2) with hematite or jasper inclusions
Sandstone Concretion
Sedimentary Concretion (Quartz sandstone with iron oxide cement)
Iron Ore (Limonite and Hematite)
Goethite/Limonite (FeO(OH)·nH2O) and Hematite (Fe2O3)
Limonite (Iron Ore)
FeO(OH)·nH2O (Hydrated iron(III) oxide-hydroxide mixture)
Yellow Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
Yellow Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
Chert (Yellow Jasper/Flint)
Silicon Dioxide (SiO2)
Red Jasper
Silicon Dioxide (SiO2) with Hematite impurities
Chalcedony (Agate / Moss Agate)
Silicon Dioxide (SiO2)
Jasper
Silicon dioxide, SiO2
Banded Agate
Silicon Dioxide (SiO2) - Chalcedony
Jasper (Chert)
Silicon Dioxide (SiO2) with iron oxide inclusions
Snakeskin Jasper
Silicon Dioxide (SiO2) with iron oxide and calcium carbonate inclusions
Heliotrope (Bloodstone)
Chalcedony variety Quartz (SiO2) with hematite/chlorite inclusions
Siltstone Concretion
Carbonate-cemented Siltstone Concretion
Lavender Chalcedony
Silicon Dioxide (SiO2)
Chert (varietal: Flint Pitted Pebble)
Cryptocrystalline Quartz (SiO2)
Banded Agate
Silicon dioxide (SiO2) - variety of Chalcedony
Red Jasper
Silicon Dioxide (SiO2) with Iron inclusions
Jasper
Silicon dioxide (SiO2)
Chert (Jasper variety)
Silicon Dioxide (SiO2)
Yellow Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
Chert (specifically Jasper/Brown Chert)
Silicon Dioxide (SiO2)
Red Jasper
Silicon Dioxide with Hematite (SiO2 + Fe2O3)
Jasper (Iron-rich)
Silicon Dioxide (SiO2) with Hematite (Fe2O3) impurities
Brown Chert or Ironstone
Cryptocrystalline Quartz (SiO2) with Iron Oxides
Black Jasper
Silicon Dioxide (SiO2) with impurities
Coal
Bituminous or Anthracite coal (carbon-rich sedimentary rock)
Chert (Flint)
Silicon Dioxide (SiO2)
Chert (River Siltstone/Quartzite)
Sedimentary Cryptocrystalline Quartz (SiO2)
Jasper
Silicon Dioxide (Microcrystalline Quartz, SiO2)
Agate (Carnelian / Chalcedony pebble)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
Flint
Silicon dioxide (Microcrystalline quartz, SiO2)
Jasper
Silicon Dioxide (Microcrystalline Quartz, SiO2)
Breciated Chert
Brecciated Chert (Microcrystalline Quartz, SiO2)
Carnelian
Silicon Dioxide (Chalcedony variety), SiO2
Carnelian (Chalcedony)
Silicon Dioxide (SiO2) - variety of Chalcedony
Jasper
Jasper (Silicon Dioxide, SiO2)
Botryoidal Chalcedony (Agate)
Silicon Dioxide (SiO2)
Chalcedony (Botryoidal)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
Agate Geode
Silicon Dioxide (SiO2)