Anthropogenic (Man Made Material Mimicking Sedimentary Rock)

Ferruginous Sandstone

Arenite with Iron-Oxide cement (primarily Fe2O3 • nH2O)

Chert (with Quartz Vein)

Chert (Siliceous sedimentary rock, predominantly Microcrystalline Quartz SiO2)

Sandstone (Ferruginous)

Arenite (primarily SiO2 with iron oxide staining/cementing)

Bauxite

Bauxite (Mixture of Al(OH)3, AlO(OH), and Fe2O3)

Petrified Wood

Silicified Wood (SiO2)

Chert (Arrowhead or Projectile Point)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Red Jasper (Polished)

Silicon Dioxide (SiO2) with Hematite inclusions

Shale

Fissile Mudstone (primarily composed of clay minerals and quartz)

Breccia

Clastic Breccia (General mineral composition depends on fragments, often SiO2 or CaCO3)

Chert (Jasper/Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert / Flint Nodules in Sandstone

Microcrystalline Quartz (SiO2) within Clastic Sedimentary Rock

Chert (Chert / Flint)

Silicon dioxide (SiO2) - Microcrystalline quartz

Chert (Nodule)

Microcrystalline Quartz (SiO2)

Chert (often called Flint in dark varieties)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Jasper variety)

Silicon Dioxide (SiO2)

Conglomerate

Conglomerate (clastic sedimentary rock)

Carnelian

Chalcedony (cryptocrystalline quartz), SiO2

Sandstone (Ferruginous)

Ferruginous Sandstone (SiO2 with Fe2O3/FeO(OH) cement)

Septarian Nodule Segment (Turtle Stone)

Septarian Concretion (CaCO3 with Siderite or Calcite infill)

Coral Fossil (Petrified Coral)

Scleractinia (Order) - Calcified Fossil Skeleton (CaCO3)

Red Sandstone (Iron-rich Sandstone)

Clastic Sedimentary Rock - Quartz Arenite / Arkose with Hematite Cement

Siltstone

Siltstone (fined-grained clastic sedimentary rock)

Chert (Flint)

Chert (Silicon Dioxide, SiO2)

Red Sandstone

Clastic Terrigenous Sedimentary Rock (typically Hematitic Quartz Arenite or Arkose)

Sandstone (Ferruginous)

Ferruginous Sandstone (SiO2 with Fe2O3)

Petrified Wood

Silicified Wood (SiO2)

Chalcedony on Matrix

Silicon Dioxide (SiO2)

Sandstone (Iron-stained)

Clastic sedimentary rock (SiO2 with Fe2O3 staining)

Shale

Fissile Mudrock (Clay-rich Sedimentary Rock)

Chert (Jasper/Flint variety)

Microcrystalline Quartz (SiO2)

Chert / River Jasper

Microcrystalline Quartz (SiO2)

Chert (Field Stone/Pebble)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Clear Quartz crystals on a Matrix base (Geode fragment)

Silicon Dioxide (SiO2)

Red Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Bauxite

Bauxite (Al2O3·2H2O)

Sandstone (Ferruginous/Banded)

Clastic Terrigenous Sandstone (SiO2 with Fe2O3 cement)

Chert (Yellow Jasper/Flint)

Silicon Dioxide (SiO2)

Chert (often called Flint or Jasper depending on color)

Chert (SiO2 - Microcrystalline or Cryptocrystalline Quartz)

Shale

Shale (clastic sedimentary rock)

Chert (Green variety)

Silicon Dioxide (SiO2)

Chert (Field Stone)

Microcrystalline / Cryptocrystalline Quartz (SiO2)

Sandstone (Water-worn)

Arenite