Organic Mineraloid And Mineral

Chert (specifically White Chert or Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (specifically a nodule with Chalcendony/Agate banding)

Microcrystalline Quartz (SiO2)

Chert (variations include Flint/Jasper)

Cryptocrystalline Silicon Dioxide (SiO2)

Chert (Iron-stained)

Chert (SiO2)

Chert / Pink Flint

Cryptocrystalline Quartz (SiO2)

Limestone (Fossiliferous)

Sedimentary Carbonate Rock (CaCO3)

Chert / Flint

Silicon Dioxide (SiO2)

Chert (specifically Flint or Jasper variant)

Microcrystalline or Cryptocrystalline Silicon Dioxide (SiO2)

Chert (specifically Red Chert / Flint)

Silicon Dioxide (SiO2)

Green Chert

Microcrystalline Quartz (SiO2)

Chert (often called Flint for dark variants)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Travertine

Terrestrial Sedimentary Limestone (CaCO3)

Chert (specifically Flint or Common Chert)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Jasper/Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Lightly weathered variety)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Pyrite in Shale

Iron Disulfide (FeS2) in Argillaceous Shale

Chert / Flint (with Crinoid Stem Molds)

Microcrystalline Quartz (SiO2)

Chert (Flint)

Microcrystalline Quartz (SiO2)

Chert (Yellow Jasper variant)

Microcrystalline Quartz (SiO2)

Chert (Yellow Jasper/Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (varieties include Flint and Jasper)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Coquina / Shelly Limestone

Coquina (Biogenic Limestone)

Dyed Pink Quartzite (Jadeite Simulant)

Silicon Dioxide (SiO2) with organic dye

Fossiliferous Limestone

Bioclastic Limestone (composition: CaCO3)

Orthoceras Fossil Limestone

Orthoceras (extinct Cephalopod fossil) in Matrix

Coquina (Fossiliferous Limestone)

Coquina (Organic Clastic Limestone)

Druzy Quartz on Vesicular Basalt

Silicon Dioxide (SiO2) in an extrusive Mafic igneous host rock

Fossiliferous Chert (with Fossil Shells)

Silicon Dioxide (SiO2) with biogenic inclusions

Chert Pebble/Nodule

Chert (a microcrystalline or cryptocrystalline sedimentary form of quartz, SiO2)

Anthracite Coal

Anthracite (Carbon-rich metamorphic coal)

Petrified Wood

Silicified Wood (SiO2)

Chert (often called Flint or Jasper)

Cryptocrystalline quartz (SiO2)

Flower Jasper

Agatized Fossil Coral / Chalcedony (SiO2)

Limestone

Calcium Carbonate (CaCO3)

Chert (Red Jasper variant)

Microcrystalline Quartz (SiO2)

Chert (River Cobble)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Chert (Nodule)

Microcrystalline Quartz (SiO2)

Chert (specifically a flint nodule component)

Microcrystalline quartz (SiO2)

Chert (River Siltstone/Quartzite type)

Microcrystalline Quartz (SiO2)

Chert (Jasper/Agate mix)

Microcrystalline Quartz (SiO2)

Chert (Jasper/Flint variety)

Silicon Dioxide (SiO2)

Chert (or Flint)

Microcrystalline Quartz (SiO2)