Chert (Flint with Chalk/Calcite)
Sedimentary cryptocrystalline quartz (SiO2)
Category
Browse sedimentary (fossiliferous) specimens identified by the Rock Identifier community.
Chert (Flint with Chalk/Calcite)
Sedimentary cryptocrystalline quartz (SiO2)
Banded Chert
Chert (a microcrystalline variety of quartz, SiO2 with minor impurities)
Chalk
CaCO3 (primarily Calcium Carbonate), biogenic sedimentary rock
Quartz Geode
Quartz (Silicon Dioxide, SiO2)
Chert Nodule
Microcrystalline Quartz (SiO2)
Quartz Geode Fragment
Silicon Dioxide (SiO2)
Limonite / Ironstone Nodule
Limonite (Hydrated iron(III) oxide-hydroxide), FeO(OH)·nH2O
Sandstone
Sandstone (Siliciclastic Sedimentary Rock)
Sandstone
Sandstone (clastic sedimentary rock)
Sandstone
Arenite (Clastic Sedimentary Rock)
Travertine
Terrestrial Sedimentary Limestone (CaCO3)
Sandstone
Arenite (Clastic Sedimentary Rock)
Limestone
Sedimentary Calcium Carbonate (CaCO3)
Sandstone with Quartz Crystal Infill
Quartz-cemented quartz arenite
Sandstone
Sandstone (SiO2 dominated)
Sandstone
Sedimentary Rock (Quartz Sandstone)
Sandstone
Quartzose Sandstone (Sedimentary Rock)
Sandstone
Sedimentary Rock (Quartzose Sandstone)
Limestone
Sedimentary Rock (Primarily CaCO3)
Sandstone
Sedimentary Rock (Quartz arenite)
Coal
Coal (Combustible sedimentary rock)
Siltstone
Siltstone (Detrital Sedimentary Rock)
Conglomerate
Conglomerate (clastic sedimentary rock)
Sandstone
Sandstone (clastic sedimentary rock)
Conglomerate
Conglomerate (clastic sedimentary rock)
Dalmatian jasper
Dalmatian stone; commonly a leucocratic alkali-feldspar-rich igneous rock with arfvedsonite or aegirine inclusions
Vesicular basalt (likely amygdaloidal basalt)
Basalt, a mafic volcanic rock composed mainly of plagioclase feldspar, clinopyroxene, and commonly olivine; vesicles are partly mineral-filled amygdules.
Quartz Pebble
Silicon Dioxide (SiO2)
Sandstone
Arenite
Limestone
Calcium Carbonate (CaCO3)
Sandstone (Water-worn Pebble)
Clastic Sedimentary Rock (primarily Quartz and Feldspar)
Sandstone
Arenite
Chert
Microcrystalline quartz (SiO2)
Sandstone (Quartzose Sandstone)
Clastic Sedimentary Rock (primarily SiO2)
Shale (or Mudstone)
Laminose Mudrock (composition: clay minerals, quartz, and mica flakes)
Sandstone
Arenite (SiO2 principal component)
Sandstone (lithic wake or graywacke)
Clastic sedimentary rock (primarily quartz and lithic fragments)
Sandstone
Arenite (SiO2 primarily)
Sandstone (Iron-stained)
Arenite (primarily SiO2 with Fe2O3 staining)
Limestone
Calcium Carbonate (CaCO3)
Sandstone Pebble
Arenite (SiO2 with minor mineral cements)
Sea Shell Fragment (Calcium Carbonate)
Aragonite / Calcite (CaCO3)