Sedimentary (Biogenic)

Petrified Wood

Silicified Wood (SiO2)

Moqui Marble (Ironstone Concretion)

Goethite/Hematite Concretion (Fe2O3 / FeO(OH))

Chert (Mudstone)

Microcrystalline Quartz (SiO2)

River Pebble (Likely Chert or Fine-Grained Sandstone/Quartzite)

Siliciclastic clast (likely Chert or Quartzarenite/Quartzite pebble)

Quartz Geode

Silicon Dioxide (SiO2) in Geode form

Banded Chert (River Siltstone)

Microcrystalline Quartz (SiO2)

Black Limestone with Calcite Veining

Bituminous Limestone (CaCO3 with Organic Carbon inclusions)

Red Jasper

Silicon Dioxide with Iron Oxide inclusions (SiO2 + Fe2O3)

Chert (Nodule)

Silicon Dioxide (SiO2)

Orthoceras Fossil Limestone

Orthoceras (extinct genus of cephalopod); Limestone matrix (CaCO3)

Red Sandstone

Arenite (Ferruginous Sandstone)

Coquina

Coquina (Bioclastic Limestone)

Painted Pet Rock (Quartzite/Sandstone base)

Silicon Dioxide (SiO2) with anthropomorphic acrylic embellishments

Ammonite Fossil in Limestone Matrix

Ammonoidea (subclass) in Calcium Carbonate (CaCO3)

Banded Sandstone

Arenite with Liesegang banding

Chert (Flint/Jasper variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Flint)

Chert (Cryptocrystalline Quartz, SiO2)

Glauconitic Sandstone (Greensand)

Glauconitic Sandstone ((K, Na)(Fe3+, Al, Mg)2(Si, Al)4O10(OH)2)

Glauconitic Sandstone (Greensand pebble)

Glauconitic Quartz Sandstone (K(Fe,Al)2(Si,Al)4O10(OH)2)

Anthracite Coal

Anthracite (Metamorphosed Bituminous Coal)

Jasper

Jasper (Silica/Silicon Dioxide, SiO2)

Ironstone Concretion (Moqui Marble)

Hematite/Goethite Concretion (Fe2O3 / FeO(OH))

Chert (Nodule)

Silicon Dioxide (SiO2)

Chert / Flint

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Sandstone

Arenite (primarily SiO2)

Banded Iron Formation (BIF) / Iron Ore

Hematite-Magnetite BIF (Fe2O3 / Fe3O4 mixed with SiO2)

Chert (Iron-stained)

Microcrystalline Quartz (SiO2)

Moqui Marble (Iron Concretion)

Iron Oxide Concretion (Goethite/Hematite Cemented Sandstone)

Petrified Wood

Silicified Wood (SiO2)

Jasper (Red/Brown Variety)

Jasper (Microcrystalline Quartz, SiO2)

Chert (variations include Flint)

Chert (Silicon Dioxide, SiO2)

Chert (Flint)

Chert (Microcrystalline Quartz, SiO2)

Red Jasper

Jasper (Silica with Iron Oxide inclusions), SiO2

Chert (specifically Blue or Grey Chert/Flint)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Chert (specifically Gray/Black Chert)

Chert (Microcrystalline or Cryptocrystalline Quartz, SiO2)

Chert (variations include Flint or Jasper)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Chert (Nodule)

Chert (primarily Microcrystalline Quartz - SiO2)

Laterite

Lateritic Soil/Rock (rich in Fe2O3 and Al2O3)

Coquina

Bioclastic Limestone

Limestone with Calcite Veins

Calcium Carbonate (CaCO3)

Coquina

Bioclastic Limestone (Coquina)