Anthropogenic Material (Man Made Sedimentary Mimic)

Sandstone (Quartzose)

Arenite (primarily SiO2)

Opalite

Synthetic glass (SiO2 + metal additions)

Sandstone

Arenite (composed primarily of SiO2)

Sandstone

Arenite

Sandstone

Arenite (SiO2 composition dominant)

Raw quartz crystal

Quartz (silicon dioxide, SiO₂), likely milky or included quartz

Dendritic Agate or Manganese Nodule in Chert/Limestone

Silicon Dioxide (SiO2) with Manganese Oxide (MnO2) inclusions

Iron Slag

Ferrous slag (primarily silicates and oxides of calcium, iron, and magnesium)

Sandstone (with potential Arkose/Lithic characteristics)

Arenite (Sedimentary rock composed of sand-sized grains)

Chert (Arrowhead/Projectile Point)

Chert (Cryptocrystalline Quartz, SiO2)

Blue tumbled glass-like specimen; likely blue slag glass

Likely man-made glass (silicate glass), not a natural mineral; exact material cannot be confirmed from the image

Carborundum (Silicon Carbide)

Silicon Carbide (SiC) / Moissanite (natural form)

Sandstone

Arenite (composed primarily of SiO2)

Chert Arrowhead

Cryptocrystalline Quartz (SiO2)

Iron-rich meteorite fragment (probable)

Unclassified meteoritic iron–nickel or stony-iron fragment

Chert (Honey Chert / Flint)

Silicon Dioxide (SiO2)

Chert (Flint)

Chert (Silicon Dioxide, SiO2)

Chert (Jasper/Flint)

Silicon Dioxide (SiO2)

Flint / Chert Pebble

Microcrystalline Quartz (SiO2)

Chert (and Agate/Chalcedony)

Microcrystalline Quartz (SiO2)

Cubic Zirconia (Faceted)

Zirconium dioxide (ZrO2)

Tumbled chert or jasper pebble

Microcrystalline quartz (SiO₂), likely chert/jasper

Chert (Chert / Flint Variety)

Microcrystalline / Cryptocrystalline Quartz (SiO2)

Chert (Cherty Shale / Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert

Silicon dioxide (SiO2)

Chert Nodule

Microcrystalline Quartz (SiO2)

Flint (gray chert)

Microcrystalline quartz (SiO₂), a variety of chert

Picture Jasper

SiO2 (Microcrystalline Quartz / Chalcedony with iron oxide impurities)

Likely flint (dark chert)

Microcrystalline quartz (SiO₂), commonly called chert or flint

Tiger Shark Fossil Tooth

Galeocerdo cuvier (fossilized)

Asphalt aggregate (crushed stone in bitumen)

Artificial composite; predominantly crushed granite, basalt, limestone, and/or recycled aggregate bound by bitumen

Weathered iron-rich rock, possibly jasper or ironstone

Likely limonite/goethite-bearing siliceous rock; exact identification requires hardness and streak tests

Likely flint (chert) fragment

Chert, microcrystalline quartz (SiO₂)

Druzy Quartz Geode

Silicon Dioxide (SiO2)

Conglomeratic gravel / polymictic breccia

Polymictic rudite, likely anthropogenic or beach/stream gravel; composition varies

Chert (specifically Flint or Nodular Chert)

Silicon dioxide (SiO2)

Chert (Jasper/Flint var.)

Silicon Dioxide (SiO2)

Chert (often called Flint or River Stone)

Microcrystalline alpha-quartz (SiO2)

Chert (Arrowhead Debitage or Flake)

Microcrystalline silica (SiO2)

Chert (Siltstone / Flint)

SiO2 (Cryptocrystalline Quartz)

Sandstone

Arenite (primarily SiO2)

Sandstone (Ferruginous)

Arenite with Iron Oxide cement (primarily SiO2 with Fe2O3)