Sedimentary (Anthropogenic)

Red jasper (likely iron-rich chert)

Microcrystalline quartz (SiO₂) colored by hematite/goethite; possibly ferruginous chert

Red Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

Quartz Geode

Silicon Dioxide (SiO2) in Calcareous or Siliceous Matrix

Jasper

Silicon dioxide (SiO2)

Red Jasper

Silicon Dioxide with Hematite impurities (SiO2 + Fe2O3)

Fossilized Shark Tooth

Carcharocles sp. or Striatolamia sp. (Phosphate/Carbonate mineralized Hydroxyapatite)

Yellow Jasper

Silicon Dioxide (SiO2) with iron inclusions

Polished fossiliferous chert or silicified limestone pebble

Microcrystalline quartz (SiO₂), possibly with calcite and iron-oxide inclusions

Puddingstone (Gowganda Tillite/Lorrain Quartzite)

Jasper Conglomerate

Sandstone

Arenite

Sandstone

Arenite (Silicon Dioxide with various mineral cements)

Tumbled yellow jasper or chert

Microcrystalline quartz (SiO₂), likely iron-oxide-stained chalcedony/chert

Conglomerate

Conglomerate (a clastic sedimentary rock)

Sandstone (Ferruginous)

Arenite (primarily SiO2 with Fe2O3 staining)

Sedimentary Pebble (Sandstone)

Clastic Sedimentary Rock (SiO2 dominant)

Quartzite (Meta-sedimentary)

Quartzite (SiO2)

Conglomerate (Red Sandstone variety)

Clastic Sedimentary Rock (Conglomeratic Sandstone)

Fossiliferous Limestone or Mudstone

Sedimentary Rock with Invertebrate Fossils

Sandstone

Sedimentary Rock (Quartz Arenite)

Sandstone

Sedimentary Rock (Quartz arenite)

Sandstone

Quartz Arenite / Sedimentary Rock

Sandstone

Sandstone (SiO2 dominated)

Likely quartz-rich sedimentary pebbles

Quartz arenite or chert-like siliceous rock; exact identification is uncertain from the photograph

Iron-rich sedimentary rock, likely banded iron formation fragment

Banded iron formation (BIF), composed chiefly of hematite/magnetite and chert

Weathered coal-bearing sedimentary rock (likely shale or mudstone with coal fragments)

Carbonaceous shale/mudstone; predominantly clay minerals, quartz, and organic carbon

Wishing Stone (Quartz-veined Sedimentary Pebble)

Silicified sedimentary rock with quartz vein (SiO2)

Banded Sedimentary Rock (Wishbone Stone / Banded Quartzite or Limestone)

Silicified limestone or banded sedimentary rock with mineral veins

Sandstone

Arenite (SiO2 composition primarily)

Geode

Quartz nodule / Chalcedony-lined cavity

Chert

Chert (Microcrystalline Quartz)

Jasper

Microcrystalline Quartz (SiO2)

Quartz Crystal

Silicon Dioxide (SiO2)

Jasper

Silicon Dioxide (Microcrystalline Quartz, SiO2)

Mixed sedimentary rock and mineral specimens

Predominantly limestone, chert, sandstone, and iron-oxide-bearing clasts; exact identification requires testing

Rounded sedimentary pebble, likely limestone or calcareous sandstone

Indeterminate carbonate-rich clastic rock; possibly micritic limestone (predominantly CaCO₃)

Chert or silicified sedimentary fragment (tentative)

Microcrystalline quartz (SiO₂), possibly silicified limestone or fossil-bearing chert

Pink sandstone or weathered sedimentary stone

Likely quartz-rich sandstone (lithified siliciclastic sediment)

Banded chert or silicified sedimentary stone

Microcrystalline quartz (chalcedony), SiO₂, possibly with iron-oxide and clay impurities

Quartz and Mixed Sedimentary Rocks

Silicon Dioxide (SiO2) mixed with various clastic sedimentary lithologies

Quartz Vein in Basalt or Sedimentary Host Rock

Silica-veined lithic fragment (SiO2 in host matrix)

Vein-filled Sedimentary Rock

Silicified sedimentary rock with quartz/calcite vein

Weathered iron-rich rock (possibly ironstone)

Indeterminate ferruginous rock; likely iron-oxide-cemented sandstone or ironstone