Sedimentary (Imitation)

Ferruginous Sandstone (Ironstone)

Sandstone with Hematite/Goethite cement (SiO2 + FeO(OH))

Chert (and/or River Pebble)

Microcrystalline silica (SiO2)

Chert / Jasper / Agate (Chalcedony Group)

Microcrystalline Quartz (SiO2)

Sandstone

Arenite (primarily SiO2, silica)

Siltstone

Siltstone (primarily composed of SiO2)

Limestone

Calcium Carbonate (CaCO3)

Limestone

Calcium Carbonate (CaCO3)

Sandstone (Ferruginous)

Arenite (Fe2O3 enriched)

Sandstone (Water-worn Cobble)

Arenite (variable composition, primarily SiO2)

André's Landing Rock (Sandstone Boulder)

Newark Supergroup Sandstone (likely Stockton Formation)

Chert (Jasper/Agate variety)

Cryptocrystalline Quartz (SiO2)

Mookaite Jasper

Silicon Dioxide (SiO2) - variety of Chert/Jasper

Petrified Wood

Silicified Wood (SiO2)

Chert (Flint)

Microcrystalline Silica (SiO2)

Chert (often called Flint or Jasper)

Chert (Microcrystalline or Cryptocrystalline Silica, SiO2)

Banded Chert (Flint)

Cryptocrystalline Quartz (SiO2)

Chalk

Calcium Carbonate (CaCO3)

Pyrite in Shale

Iron Disulfide (FeS2) in Argillaceous Shale

Chert (and Flint variant)

Microcrystalline Quartz (SiO2)

Chert (Yellow/Tan variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Limonite Concretion (Ironstone)

Limonite (FeO(OH)·nH2O) with Goethite and Hematite

Fossilized Bone Fragment

Permineralized Vertebrate Bone (Hydrox yapatite replaced by Silica or Calcite)

Septarian Nodule

Septarian Concretion (Complex of Calcite, Aragonite, and Limestone/Mudstone)

Chert (also known as Flint or Common Chalcedony)

Cryptocrystalline Silica (SiO2)

Chert (specifically Black Chert / Flint)

Silicon Dioxide (SiO2)

Ferruginous Sandstone (Gozzan-like)

Ferruginous Sandstone (SiO2 with FeO(OH) inclusions)

Petrified Wood

Silicified Wood (SiO2)

Bored Siltstone (Holey Rock)

Siltstone with Pholad borings (Lithophaga/Pholadidae trace fossils)

Jasper or Chert with Quartz Vugs

Silicon Dioxide (SiO2)

Orthoceratid Fossil in Limestone

Orthoceras (extinct genus of Nautiloid Cephalopod)

Red Sandstone

Arenite (primarily composed of SiO2 with Fe2O3 cement)

Chert (Flint/Jasper variety)

Microcrystalline Quartz (SiO2)

Red Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Petrified Wood

Silicified wood (Quartz, Chalcedony, or Opal)

Red Jasper (Chert)

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Sandstone

Arenite (primarily SiO2)

Sandstone

Clastic Sedimentary Rock (composed mostly of quartz and/or feldspar)

Sandstone

Arenite (primarily SiO2)

Crushed Limestone

Calcium Carbonate (CaCO3)

Sandstone (likely Quartzose Sandstone)

Arenite (primarily SiO2)

Sandstone (with Feldspathic/Arkose qualities)

Arenite (primarily SiO2 with KAlSi3O8 components)

Sandstone

Arenite (composed primarily of SiO2)