Limestone
Calcite (CaCO3)
Category
Browse anthropogenic (man made material mimicking sedimentary rock) specimens identified by the Rock Identifier community.
Limestone
Calcite (CaCO3)
Flint Pebble
Sedimentary cryptocrystalline quartz (SiO2)
Quartz pebble
Silicon dioxide (SiO2)
Botryoidal chalcedony (possible seam agate)
Microcrystalline quartz, SiO₂; commonly with iron-oxide and clay inclusions
Tumbled yellow jasper or serpentine
Jasper: microcrystalline quartz (SiO₂); possible serpentine: Mg₃Si₂O₅(OH)₄
Green Fluorite
Calcium Fluoride (CaF2)
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
Sandstone
Arenite (primarily SiO2 with Fe2O3)
Blue Apatite
Apatite (Calcium Phosphate) - Ca5(PO4)3(F,Cl,OH)
Pyrite
Iron Sulfide (FeS2)
Flint
Microcrystalline quartz (SiO2)
Jasper
Silicon Dioxide (SiO2)
Chert Pebble
Microcrystalline silica (SiO2)
Quartz Pebble
Silicon Dioxide (SiO2)
Limestone
Limestone (Calcium Carbonate, CaCO3)
Flint
Microcrystalline Quartz (SiO2)
Chert / Flint
Microcrystalline quartz (SiO2)
Flint / Chert
Silicon dioxide (SiO2)
Chert (Flint)
Microcrystalline quartz (SiO2)
Chert / Flint
Silicon dioxide (Microcrystalline Quartz, $SiO_2$)
Chert (or Flint)
Microcrystalline Quartz (SiO2)
Quartz (Chert/Flint variety)
Silicon Dioxide (SiO2)
Chert pebble
Microcrystalline silica (SiO2)
Quartz Pebble
Silicon Dioxide (SiO2)
Quartz
Silicon Dioxide (SiO2)
Petrified Wood (Jet or Coalified Wood appearance)
Silicified wood (principally SiO2) or Carbonized Wood
Coquina / Limonite-stained Limestone
Sedimentary Limestone with Iron Oxyhydroxide (FeO(OH)·nH2O)
Sandstone
Sedimentary Arenite
Tumbled honey calcite (probable)
Calcite, calcium carbonate (CaCO₃)
Chert
Microcrystalline Quartz (SiO2)
Quartz
Silicon Dioxide (SiO2)
Quartz, Sandstone, and Siltstone specimens
Silicon Dioxide (SiO2) and Clastic Sedimentary Rocks
Honey-colored chalcedony (rough agate/chert)
Microcrystalline quartz, SiO₂; likely chalcedony with iron-oxide staining
Quartz
Silicon Dioxide (SiO2)
Quartz Crystal
Silicon Dioxide (SiO2)
Siltstone or Mudstone
Siltstone (composed primarily of silt-sized particles)
Chert (Quartz var.)
Silicon Dioxide (SiO2)
Siltstone
Siltstone (composed of clastic quartz and feldspar grains)
Sandstone
Arenite
Quartz
Silicon Dioxide (SiO2)
Raw Quartz
Silicon Dioxide (SiO2)
Quartz
Silicon Dioxide (SiO2)