Anthropogenic (Man Made Material Mimicking Sedimentary Rock)

Flint or chert, possibly a knapped stone tool

Microcrystalline quartz (SiO₂), commonly chalcedony with possible carbonaceous impurities

Granite / Diorite (Granodiorite)

Granodiorite / Quartz Diorite

Sandstone

Arenite (SiO2 based typically)

Chert (Flint)

Silicon Dioxide (SiO2)

Chert (Cherty Shale / Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Rainbow Hematite (Man-made/Treated)

Tumbled Hematite with Titanium/Anodized coating (Iron(III) oxide, Fe2O3)

Sandstone

Arenite

Coquina

Coquina (Bioclastic Limestone)

Beaded gemstone bracelet

Indeterminate; likely small polished mineral beads, possibly turquoise or dyed stone, with metal and glass components

Polished orbicular granite heart

Granite, commonly quartz–alkali feldspar–plagioclase–biotite granite; exact locality-dependent

Probable amber fragment

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

Chert (Flint)

Chert (Microcrystalline Quartz, SiO2)

Tumbled chert or jasper pebble

Microcrystalline quartz (SiO₂), likely chert/jasper

Sandstone (likely Quartzose)

Clastic sedimentary rock (SiO2 primary)

Chert (Grey-Green Flint)

Microcrystalline silicon dioxide (SiO2)

Polished brecciated jasper pendant

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

Likely slate

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

Carnelian cabochon pendant

Carnelian, orange-red chalcedony (microcrystalline quartz, SiO₂)

Tiger Shark Fossil Tooth

Galeocerdo cuvier (fossilized)

Chert (specifically Flint or Common Chert node)

Silicon Dioxide (SiO2)

Red glassy cabochon, likely synthetic ruby or red glass

Uncertain; possible synthetic corundum (Al₂O₃, chromium-colored) or man-made glass

Grooved Maun Ball (Maul/Hammerstone-like Concretion)

Calcareous/Ferruginous Concretion in Sandstone Matrix

Chert (Flint/Jasper variety)

Microcrystalline Quartz (SiO2)

Tumbled yellow jasper or chalcedony

Microcrystalline quartz, SiO₂; likely iron-oxide-bearing jasper/chalcedony

Chert (Nodular or Massive Variety)

Cryptocrystalline Quartz (SiO2)

Quartzite

Metamorphic quartz rock (SiO2)

Chert

Microcrystalline Quartz (SiO2)

Cullet Glass (Man-made Glass Slag)

Amorphous Silica (SiO2) with chemical additives

Goldstone (Red/Brown)

Aventurine Glass (SiO2 with Copper inclusions)

Asphalt

Asphalt concrete (engineered material, not a naturally occurring rock/mineral in this form)

Chert (Flint)

Silicon Dioxide (SiO2)

Polished green-and-black banded cabochon (likely malachite imitation or dyed agate)

Uncertain; possible malachite (Cu₂CO₃(OH)₂), banded agate (SiO₂), or man-made glass

Mixed polished gemstone and mineral collection

Primarily quartz varieties (SiO₂), plus probable aventurine, rose quartz, amethyst, agate, jasper, serpentine, feldspar, and possibly dyed or man-made glass pieces

Quartzite

Metamorphic Quartzite (SiO2)

Chert (varietal: Flint/Jasper)

Silicon Dioxide (SiO2)

Tektite

Natural impact glass

Chert (variations include Flint)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Tumbled opalite (likely synthetic glass)

Opalite; typically man-made opalescent soda-lime glass, not a recognized mineral species

Blue glassy cabochon, likely blue quartz or synthetic glass

Possibly dyed blue chalcedony/quartz (SiO₂); visual identification is inconclusive

Chert (Jasper/Flint variety)

Silicon Dioxide (SiO2)

Botryoidal chalcedony with iron-oxide staining

Microcrystalline quartz (SiO₂), likely iron-oxide-bearing chalcedony

Diorite (River Pebble)

Intermediate Phaneritic Igneous Rock