Sedimentary

Bumble Bee Jasper

Calcite-bearing Volcanic Tuff (not a true Jasper)

Chert (Jasper/Chalcedony)

Microcrystalline Quartz (SiO2)

Orthoceras Fossil Limestone

Orthoceras (extinct Cephalopod fossil) in Matrix

Asphalt / Road Aggregate

Bituminous Conglomerate (synthetic)

Red Coral (Precious Coral)

Corallium rubrum (Calcium Carbonate, CaCO3)

Sandstone

Arenite (primarily SiO2 with trace Fe2O3)

Chert (often called Flint when dark)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Glauconitic Sandstone

Glauconitic Sandstone (complex silicate formula: (K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2)

Chert (Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Red Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

Chert (often colloquially referred to as Flint)

Chert (Cryptocrystalline Quartz, SiO2)

Yellow Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Coquina

Biogenic Limestone (Calcite, CaCO3)

Red Jasper

Silicon Dioxide with Hematite (SiO2 + Fe2O3)

Chert (Nodular Flint)

Microcrystalline Quartz (SiO2)

Sandstone

Arenite (SiO2 based)

Chert (specifically Yellow/Tan Chert)

Silicon Dioxide (SiO2)

Red Jasper

Silicon Dioxide (SiO2) with Hematite (Fe2O3) inclusions

Limestone

Calcium carbonate ( преимущественно CaCO3)

Jasper (Zebra Jasper)

Silicon Dioxide (SiO2) with impurities

Brecciated Jasper

Silicon Dioxide (SiO2) with Hematite impurities

Anthracite Coal

Coal (predominantly carbon)

Green Jasper with Quartz veins

Jasper (Silicon Dioxide, SiO2)

Greywacke

Greywacke (Lithofeldspathic Sandstone)

Chert (varietal Flint)

Silicon Dioxide (SiO2)

Chert (Commonly known as Flint)

Microcrystalline Quartz (SiO2)

Bay Scallop Shell

Argopecten irradians (Biogenic Calcium Carbonate / CaCO3)

Jasper (Green Jasper/Chert)

Silicon Dioxide (SiO2)

Sandstone

Arenite (SiO2 primarily)

Chert (often called Flint)

Microcrystalline Quartz (SiO2)

Septarian Nodule

Septarian Nodule (Calcite-filled Concretion)

Mookaite Jasper

Radiolarite (Silica, SiO2)

Fossiliferous Limestone (Coquina)

Biogenic Limestone (Calcium Carbonate, CaCO3)

Coquina

Biogenic Limestone (CaCO3)

Petoskey Stone

Hexagonaria percarinata (Fossilized Rugose Coral)

Chert (often called Flint for dark varieties)

Chert (SiO2)

Chert (varieties include Flint and Jasper)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Jasper/Flint variety)

Microcrystalline Quartz (SiO2)

Blue Lace Agate

Cryptocrystalline Quartz (SiO2) with trace minerals

River Pebble (Brecciated Chert/Siltstone)

Silicon Dioxide (SiO2) with mineral inclusions

Jasper Agate (specifically Brecciated Jasper)

Silicon Dioxide (SiO2) with iron oxide and clay impurities

Jasper with Quartz Vein

Silicon Dioxide (SiO2) - Microcrystalline Quartz