Limestone

Crinoid and Coral Fossils in Limestone

Fossiliferous Limestone with Rugosa (order) and Crinoidea (class)

Coquina

Biogenic Limestone (mostly Calcium Carbonate, CaCO3)

White Marble

Calcite-rich Metasomatized Carbonate (CaCO3)

Chert (Pink Jasper variant)

Microcrystalline Quartz (SiO2)

Septarian Nodule

Septarian Concretion (Composition: Calcite, Aragonite, and Limestone/Clay)

Orange Calcite (Dogtooth/Cluster)

Calcium Carbonate (CaCO3)

Chert (Green variety)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Fossil Coral

Coral Limestone (a type of biogenic sedimentary rock)

Calligraphy Stone

Mariam Jasper (Fossiliferous Limestone with Hematite and Iron)

Crinoid Marble (Fossilized Limestone)

Crinoidal Limestone (comprising Calcite/Aragonite CaCO3)

Hag Stone

Perforated Sedimentary Rock (typically Limestone or Sandstone)

Coquina

Biogenic Limestone (Calcite/Aragonite base, CaCO3)

Fossilized Horn Coral

Order Rugosa (Rugose Coral)

Chert (Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (often called Flint or Chalcedony Jasper)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Quartz Geode

Silicon Dioxide (SiO2)

Pink Granite (Alkali Feldspar Granite)

Phaneritic Felsic Igneous Rock (composed primarily of KAlSi3O8, SiO2, and NaAlSi3O8)

Quartz (Double-Terminated)

Silicon Dioxide (SiO2)

Quartz Geode

Crystalline Silicon Dioxide (SiO2) in a Geodic structure

Quartzite Pebble

Quartzite (predominantly Silicon Dioxide - SiO2)

Chert (Jasper)

Silicon Dioxide (SiO2)

Quartzite

Quartzite (primarily SiO2)

Chert (often called Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Druzy Quartz

Silicon Dioxide (SiO2)

Gastropod Steinkern (Fossil Snail Internal Mold)

Class Gastropoda (Internal Mold)

Chert (and its variety Flint)

Silicon Dioxide (SiO2) - Microcrystalline or cryptocrystalline Quartz

Shale with Plant Fossils / Carbonaceous Shale

Laminated Mudrock (Siliciclastic)

Chert (Jasper/Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Nodule)

Chert (Microcrystalline Quartz, SiO2)

Chert (Brecciated or Veined)

Silicon Dioxide (SiO2)

Basalt (River or Beach Pebble)

Basalt (Mafic Extrusive Igneous Rock)

Chert (Iron-stained)

Microcrystalline Quartz (SiO2)

Druzy Quartz on Agate/Chert

Silicon Dioxide (SiO2)

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Chert (variously known as Flint or Jasper)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Chert (Arrowhead Debitage or Flake)

Microcrystalline silica (SiO2)

Coquina / Fossiliferous Limestone

Fossiliferous Calcarenite (Calcium carbonate, CaCO3)

Chalk / Sedimentary Limestone

Calcium Carbonate (CaCO3) - Biogenic Sedimentary Rock

Calcite on Limestone (or Fossil)

Calcium Carbonate (CaCO3)

Coquina / Shelly Limestone

Coquina (calcium carbonate, CaCO3)

Coquina or Fossiliferous Limestone

Fossiliferous Calcarenite (CaCO3)

Coquina or Fossiliferous Limestone

Fossiliferous Calcarenite (CaCO3)