Man Made Rock (Sedimentary Analogue)

Fossilized Shark Tooth

Carcharocles sp. or Striatolamia sp. (Phosphate/Carbonate mineralized Hydroxyapatite)

Note: Item is a Synthetic/Man-made Object

Titanium-coated Stainless Steel (Fe-Cr-Ni-Ti)

Porous limestone (likely fossiliferous or weathered limestone)

Calcite-rich limestone; chiefly calcium carbonate (CaCO₃)

Opalite (a synthetic glass, often confused with Opal)

Silicon dioxide glass (SiO2nH2O, for natural opal)

Sandstone Pebble

Ferruginous Sandstone (SiO2 with Fe2O3)

Basalt

Basalt

Chert (Chalcedony/Agate)

Microcrystalline Quartz (SiO2)

Chert (River Siltstone/Quartzite type)

Microcrystalline Quartz (SiO2)

Blue goldstone

Man-made aventurine glass containing metallic copper particles; not a natural mineral

Likely polished quartz or glass-like mineral cabochon

Probably quartz (SiO₂), though the image cannot exclude man-made glass

Green Glass Slag

Amorphous Silicon Dioxide (SiO2) with metal oxide impurities

Hoodoo (Limestone / Siltstone Formation)

Claron Formation (Sedimentary Rock - Limestone, Mudstone, Dolomite)

Probable amber fragment

Amber (fossilized plant resin; chiefly amorphous organic resin, commonly dominated by succinite)

Blue glassy mineral specimen, possibly dyed or synthetic

Uncertain; possible blue fluorite (CaF₂), dyed chalcedony, or man-made glass

Banded Sandstone

Arenite with Liesegang banding

Bituminous Coal (with Anthracite or Vitrinite inclusion)

Organic-rich Sedimentary Rock (Carboniferous classification)

Banded Chert (River Stone)

Silicon Dioxide (SiO2)

Concrete-like aggregate surface with embedded rock fragments

Anthropogenic concrete or exposed aggregate; not a natural rock specimen

Chert (varietal Flint)

Microcrystalline quartz (SiO2)

Sandstone (with iron staining)

Quartz Arenite / Ferruginous Sandstone

Chert (Jasper / Quartz pebble)

Microcrystalline Quartz (SiO2)

Sandstone (Pebble)

Sandstone (arenite, arkose, wacke depending on composition)

Chert (Jasper/Agate variety)

Microcrystalline Quartz (SiO2)

Ferruginous Sandstone (Ironstone)

Clastic Sedimentary Rock (composed of SiO2 with Fe2O3/FeO(OH) cement)

Polished blue calcite sphere (tentative identification)

Calcite, CaCO₃; blue color generally results from trace impurities or inclusions

Quartz Sandstone Pebble

Sandstone (SiO2 dominated)

Fossilized Bored Limestone

Limestone with Ichnofossils (Gastrochaenolites or Entobia)

Crinoid Fossil Stem Segment

Class Crinoidea (Echinodermata)

Chert (varietal Chalcedony or Flint)

Silicon dioxide (SiO2) - Microcrystalline Quartz

Sandstone

Arenite

Chert (Nodule)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (or Flint)

Chert (cryptocrystalline quartz), SiO2

Red Sandstone

Arenite (Fe2O3 enriched)

Chert (Flint)

Silicon dioxide (SiO2)

Conglomeratic concrete or asphalt aggregate surface with dark bituminous chunks

Polymictic gravel aggregate; dark pieces likely bitumen/asphalt, not a natural rock

Chert (Jasper/Agate variety)

Silicon Dioxide (SiO2)

Sandstone (likely Fossilized Wood or Concrete Simulacrum)

Arenite / Silicified Wood / Anthropogenic Concrete

Crushed Limestone

Calcium Carbonate (CaCO3)

Petrified Wood

Silicified Wood (primarily SiO2)

Chert (Nodule/Pebble)

Chert (Silicon Dioxide, SiO2)

Lava Rock (Dyed)

Basalt / Volcanic scoria

Coquina

Biogenic Limestone (CaCO3)