Man Made Mineral Simulant (Glass)

Chert or silicified sedimentary fragment (tentative)

Microcrystalline quartz (SiO₂), possibly silicified limestone or fossil-bearing chert

Blue faceted gemstone ring, likely synthetic sapphire or blue topaz

Uncertain from image; possible corundum (Al₂O₃) or topaz (Al₂SiO₄(F,OH)₂)

Chert (Flint)

Microcrystalline Quartz (SiO2)

Polished brown chalcedony (likely carnelian or jasper)

Microcrystalline quartz, SiO₂; iron oxides produce the brown coloration

Quartzite (River Pebble)

Quartzite (Mainly SiO2)

Blue Lace Agate

Chalcedony (SiO2) with trace inclusions

Sandstone Concretion

Sedimentary concretion

Quartzite

Metamorphic Quartz Arenite

Chert

Microcrystalline Quartz (SiO2)

Chert (Chert / Flint Variety)

Microcrystalline / Cryptocrystalline Quartz (SiO2)

Faceted transparent gemstone pendant

Uncertain from image; likely faceted quartz (SiO₂), cubic zirconia (ZrO₂), or glass imitation

Polished yellow calcite

Calcite (calcium carbonate, CaCO₃)

Chalcedony / milky quartz flake

Microcrystalline quartz (SiO₂), likely chalcedony; possibly a worked quartzite or chert fragment

Chert

Microcrystalline silica (SiO2)

Chert (Flint)

Chert (Silicon Dioxide, SiO2)

Flint / Chert Pebble

Microcrystalline Quartz (SiO2)

Chert (and Agate/Chalcedony)

Microcrystalline Quartz (SiO2)

Chert (Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Green cabochon gemstone, likely aventurine or dyed chalcedony

Indeterminate from image; possible quartz variety (SiO₂), including aventurine quartz or chalcedony

Beaded gemstone jewelry, likely carnelian and green aventurine

Carnelian: orange chalcedony (microcrystalline SiO₂); green aventurine: quartz with fuchsite or other inclusions (SiO₂)

Sandstone (Pebble)

Sandstone (arenite, arkose, wacke depending on composition)

Asphalt (Bituminous Concrete)

Composite material (bitumen binder with mineral aggregate)

Polished orbicular jasper (likely ocean jasper)

Siliceous microcrystalline quartz/chalcedony with iron-oxide and volcanic inclusions; commonly called ocean jasper

Chert (Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Jasper variation)

Microcrystalline Quartz (SiO2)

Tumbled quartz-rich pebble

Microcrystalline quartz (SiO₂), possibly milky quartz or quartzite

Blue-green chrysocolla rough specimen

Chrysocolla, hydrated copper aluminosilicate; commonly associated with malachite, quartz, and limonite

Quartzite

Silica (SiO2) quartzite

Black tourmaline bead bracelet, possibly mixed with smoky quartz or brown tourmaline

Schorl tourmaline, NaFe₃Al₆(BO₃)₃Si₆O₁₈(OH)₄; exact beads cannot be confirmed visually

Red Quartzite

Quartzite (Metamorphosed Quartz Arenite)

Chert / Flint

Microcrystalline Quartz (SiO2)

Chert (Flint)

Silicon Dioxide (SiO2)

Chert (Flint / Jasper)

Silicon Dioxide (SiO2)

Likely gold-colored metal ring with a possible gemstone

Uncertain; possibly gold alloy (Au) with a small quartz or glass-like setting

Heart-shaped faceted gemstone pendant

Likely yellow quartz (citrine) or synthetic yellow stone, set in metal with small clear accent stones

Carnelian cabochon pendant

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

Diamond

Diamond (pure Carbon, C)

Chert

Microcrystalline Quartz (SiO2)

Chert (Jasper/Flint)

Silicon Dioxide (SiO2)

Quartzite

Metamorphic Quartzite (SiO2)

Chert (Chert / Flint)

Microcrystalline Quartz (SiO2)

Tumbled blue-green stone, likely chrysocolla or dyed chalcedony

Probable chrysocolla (hydrated copper aluminosilicate; variable composition), though appearance could also represent dyed chalcedony