Anthropogenic Material (Man Made Sedimentary Mimic)

Sandstone (Ferruginous)

Sandstone (SiO2 with iron oxide impurities)

Weathered fossil shell fragment

Indeterminate bioclastic carbonate, likely molluscan shell (calcium carbonate, commonly aragonite or calcite)

Blue slag glass or dyed glass-like industrial material

Amorphous silicate glass; likely copper-bearing blue slag, but possibly colored man-made glass

Iron meteorite (probable, possibly industrial iron slag)

Fe–Ni metallic alloy, commonly kamacite and taenite

Likely rough metallic meteorite fragment

Unclassified iron or stony-iron meteorite; identification is uncertain from the image alone

Chert / Flint

Silicon Dioxide (SiO2)

Jasper (Banded Jasper)

Silicon Dioxide (SiO2) with impurities

Coquina

Coquina (Biogenic Limestone / CaCO3)

Iron-stained quartz-rich rock, possibly jasper or chert

Microcrystalline quartz (SiO₂) with iron oxides/hydroxides

Wood Stone (Dragon Stone variant)

Argillaceous Sedimentary Rock

Chert (often called Flint or Jasper)

Microcrystalline Quartz (SiO2)

Chert (Flint)

Microcrystalline quartz (SiO2)

Chert (Nodule)

Microcrystalline Quartz (SiO2)

Chert (Flint)

Microcrystalline Silica (SiO2)

Sandstone

Arenite (siliciclastic sedimentary rock composed mostly of quartz)

Sandstone (Picture Sandstone)

Arenite (primarily SiO2 with iron oxide impurities)

Chalk

Carbonate rock (mainly CaCO3)

Pyrite-rich Volcanic Rock

Iron Disulfide (FeS2) in Volcanic Matrix

Chalk

Calcite (CaCO3)

Sandstone

Arenite (composed primarily of SiO2)

Sandstone (Pebble)

Sandstone (arenite, arkose, wacke depending on composition)

Likely slate

Slate, a fine-grained metamorphic rock composed mainly of mica-group minerals and quartz

Sandstone

Arenite

Fossil fish impression or partial fish fossil

Indeterminate fossilized fish; likely compressed vertebrate remains in sedimentary rock

Polished greenstone/serpentine pebble (probable)

Serpentinite, dominated by serpentine-group minerals (lizardite/chrysotile); possible accessory olivine or chlorite

Polished brecciated jasper pendant

Jasper, an opaque microcrystalline variety of chalcedony (mostly SiO₂), with iron-oxide staining and likely brecciation

Chert (Jasper)

Microcrystalline Quartz (SiO2)

Sandstone Pebble

Ferruginous Sandstone (SiO2 with Fe2O3)

Beach Pebble (Chalcedony / Chert)

Silicon Dioxide (SiO2)

Coquina

Bioclastic Limestone

Porous limestone (likely fossiliferous or weathered limestone)

Calcite-rich limestone; chiefly calcium carbonate (CaCO₃)

Yellow Chert (Chalcedony)

Microcrystalline Quartz (SiO2)

Chert (varietal Flint)

Microcrystalline quartz (SiO2)

Petrified Wood

Silicified Wood (SiO2)

Graphite

Graphite (Carbon, C)

Chert Nodule

Microcrystalline Quartz (SiO2)

Sandstone

Sedimentary Rock (Quartz Sandstone)

Sandstone

Arenite

Chert (Common Variety, Jasper)

Microcrystalline Quartz (SiO2)

Chert (Yellow Jasper/Flint)

Microcrystalline Quartz (SiO2)

Chert (Nodule)

Chert (Alpha-Quartz, SiO2)

Chert (Jasper/Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)