Mineral (Silicate Replaced Organic Material)

Ocean Jasper

Orbicular Jasper (Silicon Dioxide with impurities), SiO2

Fuchsite Schist

Chromium-rich Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2) in Schist

Limonite (vibrant yellowish-brown iron oxide)

Limonite (FeO(OH)·nH2O)

Chert (Flint)

Microcrystalline Quartz (SiO2)

Sandstone (Quartzose Sandstone)

Arenite

Chert (Jasper/Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert / Jasper

Microcrystalline Quartz (SiO2)

Ironstone Concretion / Limonite Node

Goethite and Limonite (FeO(OH) nH2O)

Ammonite Fossil

Ammonoidea (Calcium carbonate or Pyrite replaced)

Chert (Jasper variation)

Microcrystalline Quartz (SiO2)

Chert (Jasper/Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Smoky Quartz (Tumbled)

Smoky Quartz (SiO2 - Silicon Dioxide)

Chert (Flint variety)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Chert (and/or River Pebble)

Microcrystalline quartz (SiO2)

Sandstone (Quartzose)

Arenite (primarily SiO2)

Amber

Fossilized Tree Resin (Generic formula roughly C10H16O)

Moss Agate

Silicon Dioxide (SiO2) with inclusions of Manganese or Iron oxides

Quartz (specifically Milky/Gray Quartz vein)

Silicon Dioxide (SiO2)

Sandstone

Arenite (composed primarily of SiO2)

Chert / Flint

Microcrystalline Quartz (SiO2)

Chert (Flint Nodules)

Microcrystalline Quartz (SiO2)

Serpentinite

Serpentinite (complex silicate minerals including Mg3Si2O5(OH)4)

Nephrite Jade (River Cobble)

Nephrite (Silicate mineral: Ca2(Mg, Fe)5Si8O22(OH)2)

Sandstone

Arenite (composed primarily of SiO2)

Glauconitic Sandstone

Glauconitic Sandstone (contains (K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2)

Basalt with Quartz/Feldspar Inclusion

Basalt (containing Silicate minerals such as SiO2 and (Ca,Na)(Al,Si)4O8)

Chert Pebble (Jasper/Quartz variety)

Microcrystalline Quartz (SiO2)

Acicular Azurite (indicated by deep blue, fibrous/fuzzy appearance)

Azurite (Copper Carbonate Hydroxide) - Cu3(CO3)2(OH)2

Asphalt / Bituminous Aggregate

Bituminous mixture (Hydrocarbon-based sediment)

Quartz Geode

Silicon Dioxide (SiO2)

Chert (Nodule)

Silicon Dioxide (SiO2)

Chert (specifically Flint)

Microcrystalline Quartz (SiO2)

Sandstone

Clastic sedimentary rock (primarily SiO2)

Chert (often called Flint)

Cryptocrystalline Quartz (SiO2)

Sandstone

Arenite (primarily SiO2)

Turquoise and Red Coral (with Grizzly Bear Claw)

Turquoise (CuAl6(PO4)4(OH)8·4H2O) and Precious Coral (Corallium rubrum)

Sandstone (Quartzose Sandstone)

Clastic Sedimentary Rock (primarily SiO2)

Chert (Red Jasper variant)

Microcrystalline Quartz (SiO2)

Garnet

Garnet Group (Silicate Minerals), formula varies e.g., Almandine Fe3Al2(SiO4)3

River Jasper (Green Jasper)

Silicon Dioxide (SiO2) with impurities

Terracotta (Man-made ceramic brick fragment)

Baked clay / High-iron ceramic (Silicate-based ceramic)