Anthropogenic Material (Man Made Sedimentary Mimic)

Conglomerate

Conglomerate (clastic sedimentary rock)

Chert (Flint/Jasper variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Flint)

Microcrystalline Quartz (SiO2)

Chert (Green variety)

Silicon Dioxide (SiO2)

Sandstone (with Liesegang rings or Oxidation)

Arenite (primarily Quartz SiO2 with Iron Oxide Fe2O3 staining)

Milky Quartz

Silicon Dioxide (SiO2)

Chert (Field Stone)

Microcrystalline Quartz (SiO2)

Chert (Arrowhead Artifact)

Chert (SiO2)

Chert (Gravel)

Microcrystalline Quartz (SiO2)

Chert (includes Flint & Jasper)

Chert (Siliceous sedimentary rock, chemical formula SiO2)

Chert (Field Pebble)

Microcrystalline / Cryptocrystalline Quartz (SiO2)

Chert (specifically Blue Chert or Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (varietal Flint)

Silicon Dioxide (SiO2)

Glauconitic Sandstone (or Greensand)

Glauconitic Siliciclastic Rock (Containing (K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2)

Chert / Flint

Microcrystalline Silica (SiO2)

Chert (often called Flint or Jasper depending on color)

Chert (SiO2 - Microcrystalline or Cryptocrystalline Quartz)

Petrified Wood

Silicified wood (primarily SiO2)

Gneiss

Foliated Metamorphic Rock (Gneiss)

Clear Quartz crystals on a Matrix base (Geode fragment)

Silicon Dioxide (SiO2)

Sandstone (Weathered Pebble)

Arenite (primarily SiO2)

Chert (Flint/Chalcedony)

Microcrystalline Quartz (SiO2)

Sandstone

Sandstone (various mineral compositions)

Sandstone (Pebble/Cobble)

Sandstone (arenite is a more precise term for sandstone with less than 15% matrix; this specimen appears to be a lithic or quartz arenite)

Coquina or Fossiliferous Limestone

Biogenic Limestone (Calcite/Aragonite CaCO3)

Chert (specifically Gray Chert)

Silicon Dioxide (SiO2)

Petrified Wood

Silicified Wood (primarily SiO2)

Chert (Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chalk / Sedimentary Limestone

Calcium Carbonate (CaCO3) - Biogenic Sedimentary Rock

Chert / Flint Nodules in Sandstone

Microcrystalline Quartz (SiO2) within Clastic Sedimentary Rock

Chert (variant Flint or Jasper)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert / Flint

Cryptocrystalline Quartz (Silicon Dioxide, SiO2)

Chert (Pink/Red variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Jasper/Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Petrified Wood

Silicified Wood (SiO2)

Petrified Wood

Silicified Wood (SiO2)

Green Jasper (with Quartz veining)

Jasper (Silica-rich microcrystalline variety of Quartz), formula: SiO2

Green Aventurine

Silicon Dioxide (SiO2) with inclusions of Fuchsite

Chert / Jasper

Silicon Dioxide (SiO2)

Sandstone

Arenite (primarily SiO2 - Silicon Dioxide)

Sandstone (Ferruginous)

Arenite with Iron Oxide cement (SiO2 + Fe2O3)

Ferruginous Sandstone

Sandstone, Iron-rich

Chert

Microcrystalline silica (SiO2)