Man Made Material (Simulated Mineral)

Arrowhead made of Moss Agate

Silicon Dioxide (SiO2) with manganese/iron inclusions

Black stone-bead bracelet, likely black onyx or agate

Probably chalcedony, microcrystalline quartz (SiO₂); the photo alone cannot confirm the bead material

Green Aventurine

Quartz (SiO2) with Fuchsite inclusions

Synthetic Resin (Artificial Specimen)

Polyurethane or Polyester Resin

Luminous Stone (Glow-in-the-dark Synthetic/Man-made Stone)

Strontium Aluminate tinted glass or resin (Crystalline silicate/oxide mix)

Granite / Diorite (Granodiorite)

Granodiorite / Quartz Diorite

Flint (gray chert)

Microcrystalline quartz (SiO₂), a variety of chert

Blue glass-like tumbled specimen

Most likely cobalt-blue slag glass or manufactured glass; not confidently identifiable as a natural mineral from the image

Tumbled chert or jasper pebble

Microcrystalline quartz (SiO₂), likely chert/jasper

Chert (Flint)

Silicon dioxide (SiO2)

Yellow Sapphire (Raw)

Corundum (Al2O3)

Sand Tiger Shark Tooth (Fossil)

Carcharias taurus (fossilized dentin/enameloid)

Red glass-like crystal, likely synthetic ruby or red glass

Uncertain from image; possible corundum (ruby), Al₂O₃, or synthetic glass

Chert (Honey Chert / Flint)

Silicon Dioxide (SiO2)

Chert

Microcrystalline silica (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)

Chipped Glass/Plastic Fragment

Silicon dioxide (SiO2) for glass (amorphous) or various polymer compounds for plastic

Diorite (River Pebble)

Intermediate Phaneritic Igneous Rock

Likely flint (chert) fragment

Chert, microcrystalline quartz (SiO₂)

Chert (Flint)

Silicon Dioxide (SiO2)

Polished green stone bead, likely dyed howlite or magnesite

Possibly dyed Ca₂B₅SiO₉(OH)₅ (howlite) or MgCO₃ (magnesite); identification is uncertain from the photo

Red Slag Glass (Cullet)

Amorphous Silicon Dioxide (SiO2) with metallic dopants

Rounded quartz pebble

Quartz (silicon dioxide, SiO₂)

Green Slag Glass

Cullet (Amorphous Silicon Dioxide with impurities)

Diamond (in a jewelry setting)

Diamond (Carbon, C)

Banded Calcite (often commercially sold as 'Mexican Onyx' or 'Honey Onyx')

Calcite (Calcium Carbonate, CaCO3)

Sandstone

Sandstone (composed predominantly of Quartz, SiO2, with Feldspar and Clay minerals)

Brown chert (flint)

Microcrystalline quartz (SiO₂), commonly called chert; “flint” is a dark variety

Sandstone

Arenite

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 (Chert / Flint Variety)

Microcrystalline / Cryptocrystalline Quartz (SiO2)

Sandstone

Arenite (variable SiO2 composition)

Yellow chalcedony (likely lemon agate or yellow jasper)

Microcrystalline quartz, SiO₂; possibly iron-bearing jasper or chrysoprase-like chalcedony

Tumbled purple quartz, likely amethyst or lavender quartz

Quartz (SiO₂), probably iron-colored amethyst; exact variety uncertain from the image

Sandstone

Arenite (SiO2 primarily)

Beaded bracelet, likely green aventurine and yellow citrine or dyed quartz

Quartz, SiO₂ (green aventurine may contain fuchsite inclusions)

Tumbled amber-colored chalcedony or jasper

Microcrystalline quartz (SiO₂), likely iron-stained chalcedony/jasper