Anthropogenic Material (Man Made Sedimentary Mimic)

Ironstone Concretion

Ironstone (Limonite/Goethite Concretion)

Siltstone with Concretion

Siltstone (composed of hydraulic silicates and quartz particles)

Sandstone

Arenite

Chert (Flint)

Chert (Cryptocrystalline Silica, SiO2)

Chert (Flint Arrowhead)

Silicon Dioxide (SiO2)

Coquina

Biogenic Limestone (Coquina)

Chert (and associated river cobbles)

Silicon dioxide (SiO2)

Chert (and/or Flint)

Chert (Cryptocrystalline variety of Quartz, SiO2)

Chalk

Calcium carbonate (CaCO3)

Cobalt Blue Slag Glass

Amorphous Silicon Dioxide (anthropogenic) with Cobalt additives

Crushed Stone / Gravel

Aggregatus saxum (variable mineral composition)

Sandstone

Arenite (composed primarily of SiO2)

Probable amber fragment

Amber (fossilized plant resin; chiefly amorphous organic resin, commonly dominated by succinite)

Sandstone Geode (Ironstone Concretion)

Arenite with Limonite/Hematite matrix (SiO2 with Fe-oxides)

Blue Goldstone

Synthetic Aventurescent Glass (Cobalt-doped soda-lime glass)

Chert (often called Flint)

Chert (SiO2)

Chert Arrowhead

Cryptocrystalline Quartz (SiO2)

Sandstone (likely Quartzose Sandstone)

Arenite

Chert (often called Flint or Agate nodule)

Cryptocrystalline Quartz (SiO2)

Bituminous Coal (with Anthracite or Vitrinite inclusion)

Organic-rich Sedimentary Rock (Carboniferous classification)

Sea Glass

Amorphous silicon dioxide (Man-made glass weathered by nature)

Sandstone

Sedimentary Rock (Quartz Sandstone)

Chert (Arrowhead Fragment)

Silicon Dioxide (SiO2)

Flint / Chert

Microcrystalline Quartz (SiO2)

Coquina

Bioclastic Limestone (composed primarily of CaCO3)

Chert (Yellow Jasper)

Cryptocrystalline Quartz (SiO2)

Sandstone (Quartzose)

Sandstone (SiO2 dominated)

Limestone (Elephant Skin or Karst-weathered)

Calcium Carbonate (CaCO3)

Turquenite (Dyed Howlite)

Dyed Ca2B5SiO9(OH)5 (Calcium Borosilicate Hydroxide)

Fossilized Coral (Coquina/Limestone)

Cnidaria Anthozoa (Fossilized)

Titanium Aura Quartz (Aura Quartz)

Titanium-coated Silicon Dioxide (SiO2)

Chert (and Jasper/Chalcedony mixture)

Microcrystalline Quartz (SiO2)

Diamond

Native Carbon (C)

Red Howlite (Dyed)

Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5) with Red Dye

Chert (Flint)

Microcrystalline Quartz (SiO2)

Chert (often called Flint)

Microcrystalline Quartz (SiO2)

Sandstone (Red/Brown Variety)

Arenite (composed primarily of SiO2 with Fe2O3 iron oxide inclusions)

Blue Goldstone

Aventurine Glass (SiO2 with Cobalt/Copper inclusions)

Howlite

Howlite (Calcium Borosilicate Hydroxide: Ca2B5SiO9(OH)5)

Chert (Flint)

Chert (SiO2)

Limestone

Calcareous sedimentary rock (CaCO3)

Moissanite

Silicon Carbide (SiC)