Chalk
Carbonate rock (mainly CaCO3)
Category
Browse sedimentary (man made conglomerate) specimens identified by the Rock Identifier community.
Chalk
Carbonate rock (mainly CaCO3)
Sandstone (Quartzose)
Sandstone (SiO2 dominated)
Chert
Microcrystalline Quartz (SiO2)
Coquina
Biogenic Limestone (Calcium Carbonate, CaCO3)
Banded Jasper / Chert Beach Pebble
Microcrystalline Quartz (SiO2)
Chert
Microcrystalline Quartz (SiO2)
Chert / Flint
Silicon Dioxide (Microcrystalline Quartz, SiO2)
Flint / Chert
Microcrystalline quartz (SiO2)
Brecciated Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
Chert (specifically Flint or Nodular Chert)
Silicon dioxide (SiO2)
Petrified Wood
Silicified Wood (SiO2)
Chert (Jasper/Flint var.)
Silicon Dioxide (SiO2)
Chert (often called Flint or River Stone)
Microcrystalline alpha-quartz (SiO2)
Chert (Flint)
Silicon Dioxide (SiO2)
Red Jasper
Silicon Dioxide (SiO2) with Hematite (Fe2O3)
Chert (Flint)
SiO2 (Microcrystalline Quartz)
Quartz Sandstone Pebble
Sandstone (SiO2 dominated)
Limestone
Calcareous sedimentary rock (CaCO3)
Fossiliferous Limestone (Crinoid stem fossils)
Sedimentary Limestone with Crinoidea ossicles
Sandstone
Arenite
Mica Schist
Mica Schist (principally Biotite/Muscovite, Quartz, and Feldspar)
Coquina
Bioclastic Limestone (composed primarily of CaCO3)
Coquina / Fossiliferous Limestone
Calcareous bioclastic sedimentary rock (CaCO3)
Chert Arrowhead
Cryptocrystalline Quartz (SiO2)
Chert (specifically Flint)
Chert (SiO2)
Titanium Aura Quartz (Aura Quartz)
Titanium-coated Silicon Dioxide (SiO2)
Jasper
Silicon dioxide (SiO2) with impurities
Chert / Flint
Silicon Dioxide (SiO2)
Fossiliferous Limestone
Biogenic Limestone (Calcium Carbonate, CaCO3)
Chert (Jasper variety)
Silicon Dioxide (SiO2)
Limestone
Sedimentary Calcium Carbonate (CaCO3)
Blue Chalcedony
Silicon Dioxide (SiO2) - Microcrystalline Quartz
Chert (often called Flint)
Chert (Cryptocrystalline Quartz, SiO2)
Chert (Flint)
Microcrystalline quartz (SiO2)
Jasper
Silicon dioxide (SiO2) with impurities
Chert (often called Flint)
Chert (Microcrystalline or cryptocrystalline Silica, SiO2)
Chert / Flint
Cryptocrystalline quartz (SiO2)
Chert (Flint)
Microcrystalline Quartz (SiO2)
Chert (specifically Jasper or Flint)
Cryptocrystalline Quartz (SiO2)
Chert (Jasper variation)
Microcrystalline Quartz (SiO2)
Coquina
Bioclastic Limestone (Coquina)
Chalk
Calcium carbonate (CaCO3)