Sedimentary (Fossilized Organic Remains)

Red Jasper

Silicon Dioxide with Iron Oxide (SiO2)

Chert (specifically Gray Chert)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert

Silicon dioxide (SiO2)

Chert (and Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Banded)

Microcrystalline Quartz (SiO2)

Chert (Flint)

Silicon Dioxide (SiO2)

Chert / Flint

Silicon Dioxide (SiO2)

Mookaite Jasper

Silicified Radiolarite (SiO2)

Fossilized Shark Tooth

Carcharodon (Galeocerdo sp. or Lamniform)

Chert (often called Flint or River Pebble)

Microcrystalline Quartz (SiO2)

Dragon Vein Agate

Chalcedony (cryptocrystalline silica, SiO2) variety Agate

Tree Agate (or Moss Agate), faceted into a crystal tower

Dendritic Agate (Silicon Dioxide, SiO2)

Fossiliferous Limestone (Crinoidal)

Bioclastic Limestone (predominantly CaCO3)

Shale

Shale (comprised mostly of clay minerals and quartz)

Shale

Fissile Mudstone (Shale)

Shungite

Non-crystalline carbon (high-carbon metamorphic rock)

Pyrite

Iron Sulfide (FeS2)

Flint

Chert (Silicon dioxide, SiO2)

Chert (Flint variety)

Silicon Dioxide (SiO2)

Banded Chert (River Cobble)

Microcrystalline Quartz (SiO2)

Coquina / Fossiliferous Limestone

Bioclastic Limestone (CaCO3)

Chert (often called Flint or Jasper based on color)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (specifically Gray/Banded Chert)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Limestone

Calcium Carbonate (CaCO3)

Quartz (Milky/Clear variety)

Silicon Dioxide (SiO2)

Chert (specifically Flint or Common Opal variant)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Fossiliferous Limestone (Shell Fragment)

Biogenic Limestone (Calcium Carbonate / CaCO3)

Chert

Microcrystalline Quartz (SiO2)

Fossiliferous Limestone (with Crinoids/Coral)

Fossiliferous Limestone (CaCO3)

Bituminous Coal

Organic sedimentary rock (humic coal)

Bituminous Coal (with Anthracite or Vitrinite inclusion)

Organic-rich Sedimentary Rock (Carboniferous classification)

Chert (Nodule)

Chert (composed of Microcrystalline Silica/SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Chalk / Sedimentary Limestone

Calcium Carbonate (CaCO3) - Biogenic Sedimentary Rock

Chert (often called Flint when dark)

Microcrystalline silicon dioxide (SiO2)

Chert (Flint)

Silicon Dioxide (SiO2)

Chert (variations include Flint or Jasper)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (variations include Flint or Jasper)

Chert (Silicon Dioxide, SiO2)

Chert (Arrowhead/Tool Grade)

Microcrystalline Quartz (SiO2)

Fossiliferous Limestone

Fossiliferous Calclutite / Bio-calcarenite (CaCO3)

Chert

Microcrystalline silica (SiO2)

Bituminous Coal

Bituminous coal (Organic Sedimentary Rock)