Anthropogenic (Man Made Product Subject To Geological Processes)

Likely blue glass or synthetic gemstone jewelry

Uncertain; possibly synthetic spinel, cubic zirconia, or blue glass

Rounded quartz-rich cobble, likely quartzite

Quartzite; predominantly SiO₂ (recrystallized quartz)

Quartzite

Metamorphic Quartzite (SiO2)

Limonite-stained Quartz

Silicon Dioxide (SiO2) with Hydrated Iron Oxide (FeO(OH)·nH2O) coatings

Polished blue-green glassy slag or coated mineral fragment

Most likely man-made colored glass/slag; exact composition cannot be determined visually

Slag Glass (Cullet)

Amorphous Silica / Glass residue

Coal (most likely Bituminous or Anthracite)

Coal (primarily composed of carbon with varying amounts of other elements)

Likely tumbled epidote-bearing rock or green jasper

Epidote-group silicate, possibly in a jasper or serpentinite matrix

Quartzite

Metamorphic Quartzite

Gold (Elemental Metal)

Gold (Au)

Colorless faceted quartz-like gemstone

Likely quartz (SiO₂), though the appearance may also indicate man-made glass or cubic zirconia

Blue Sapphire and Diamond (Set in Metal)

Corundum (Al2O3) and Diamond (C)

Chipped Glass/Plastic Fragment

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

Green-and-white terrazzo (likely serpentine/marble aggregate)

Composite decorative stone; probable serpentinite (Mg₃Si₂O₅(OH)₄) with white calcite marble fragments in cementitious matrix

Metallic Ornament / Jewelry

N/A - This is an artificial object, not a geological specimen.

Quartzite with Mafic Intrusion (Gneiss/Schist Contact)

Metamorphic Quartzite (SiO2) with Amphibole/Biotite Schist

Quartzite

Quartzite (SiO2)

Blue Goldstone

Aventurine Glass

Schorl (Black Tourmaline)

Schorl (Sodium Iron Aluminum Borosilicate Hydroxide), NaFe3Al6(BO3)3Si6O18(OH)4

Polished amethyst bead fragments

Amethyst, purple quartz (SiO₂)

Quartzite

Metamorphic Quartzite (SiO2)

Mica schist (likely biotite-rich schist)

Mica schist, dominated by biotite mica (K(Mg,Fe)₃AlSi₃O₁₀(F,OH)₂), with possible quartz and feldspar

Goldstone (Red)

Aventurine Glass

Cardstock (Paper)

Cellulose (C6H10O5)n

Inlaid stone ring (likely jasper or agate)

Likely microcrystalline quartz (chalcedony, SiO₂), possibly jasper, with decorative mineral inlays

Marble

Recrystallized Calcite (CaCO3)

Quartz

Silicon Dioxide (SiO2)

Chert (Nodule)

Chert (Alpha-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

Sea Glass (Frosted Glass)

Amorphous Silica (SiO2) with various metal oxide impurities

Granite

Granite (Felsic Plutonic Rock)

Hematite

Hematite (Fe2O3)

Metal Alloy (Jewelry)

Not a naturally occurring rock or mineral; likely a metal alloy for jewelry. Possible compositions include sterling silver (92.5% silver, 7.5% copper), or other silver/gold alloys.

Fossiliferous Chert (with Brachiopod or Mollusk fragments)

Silicon dioxide (SiO2) with Calcium Carbonate (CaCO3) inclusions

Blue Goldstone

Synthetic Aventurescent Glass (Cobalt-doped soda-lime glass)

Red-orange sunstone (likely aventurine feldspar) bead bracelet

Feldspar, commonly oligoclase or labradorite with copper inclusions; composition varies by source

Clear quartz crystal pendant

Quartz (silicon dioxide, SiO₂)

Goldstone (Brown)

Aventurine glass

Green Aventurine

Quartz (SiO2) with Fuchsite inclusions

Black Tourmaline

Schorl (Na(Fe2+)_{3}Al_{6} (BO_{3})_{3} (Si_{6}O_{18})(OH)_{4})

Blue Tiger's Eye (Hawk's Eye)

Pseudomorph of Quartz after Crocidolite (SiO2)

Pebble (likely Quartzite or Chert)

Clastic Sediment, potentially composed of SiO₂ (Quartz)