Chert (Flint Nodules)
Sedimentary cryptocrystalline quartz (SiO2)
Category
Browse sedimentary (physico chemical precipitate) specimens identified by the Rock Identifier community.
Chert (Flint Nodules)
Sedimentary cryptocrystalline quartz (SiO2)
Banded Iron Formation (BIF) with Quartz
Banded Iron Formation, often composed of alternating layers of hematite (Fe2O3) or magnetite (Fe3O4) and chert (microcrystalline quartz, SiO2)
Chert pebble
Microcrystalline silica (SiO2)
Chert (Flint)
Chert (Cryptocrystalline Quartz, SiO2)
Gold in Quartz Matrix
Native Gold (Au) with Quartz (SiO2)
Quartz
Silicon Dioxide (SiO2)
Green Calcite
Calcium Carbonate (CaCO3)
Honey calcite (orange calcite)
Calcite, calcium carbonate (CaCO₃)
Quartz
Silicon Dioxide (SiO2)
Tumbled iron-rich chert or jasper
Microcrystalline quartz (SiO₂), likely limonitic/hematitic variety
Quartz Druzy in Chert Pebble
Silicon Dioxide (SiO2) - Microcrystalline & Crystalline Quartz
Limestone
Calcium carbonate (CaCO3) / Limestone
Chert Nodule / Flint
Microcrystalline Quartz (SiO2)
Chert (with Manganese Dendrites)
Chert (Cryptocrystalline Quartz, SiO2)
Chert
Microcrystalline silica (SiO2)
Quartz (Milky/Clear)
Silicon Dioxide (SiO2)
Hematite
Iron Oxide (Fe2O3)
Yellow Chalcedony (Agate/Chert)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
Clear Quartz
Silicon Dioxide (SiO2)
Quartz Geode (Cracked Open Fragment)
Silicon Dioxide (SiO2)
Chert (Nodular)
Microcrystalline Quartz (SiO2)
Orange Calcite
Calcium Carbonate (CaCO3)
Chert Pebble with Quartz Veins
Microcrystalline Quartz (SiO2)
Banded Onyx (Cave Calcite)
Calcite (CaCO3), often called Mexican Onyx or Travertine
Jasper
Microcrystalline Quartz (SiO2)
Crystalline Quartz (Rough)
Quartz (Silicon Dioxide, SiO2)
Orange Calcite
Calcite (Calcium Carbonate, CaCO3)
Banded Agate / Chalcedony
Cryptocrystalline Quartz (SiO2)
Aragonite Star Cluster
Aragonite (Calcium Carbonate, CaCO3)
Yellow Jasper / Chert
Silicon Dioxide (SiO2) with Goethite or Limonite inclusions
Sandstone (Ferruginous Concretion)
Arenite (with iron oxide cement)
Banded Iron Formation (BIF) / Chert
Banded Iron Formation (SiO2 with Fe2O3 / Fe3O4)
Blue Calcite Sphere
Calcium Carbonate (CaCO3)
Weathered limestone pebble
Limestone, predominantly calcite (CaCO₃), possibly fossiliferous or oolitic
Chert (with Quartz vein/coating)
Microcrystalline Quartz (SiO2)
Quartz-veined Limestone
Sedimentary limestone with quartz/calcite veinlets
Chert Nodule
Microcrystalline Quartz (SiO2)
Banded Iron Formation (BIF)
Magnetite-hematite-chert formation
Barite (Desert Diamond)
Barite (Barium Sulfate, BaSO4)
Limestone with Calcite Veining
Calcium Carbonate (CaCO3)
Hematite Nodular Iron Ore
Hematite (Fe2O3)
Jasper with Quartz Vein
Microcrystalline quartz (SiO2) with impurities