Man Made Mineral Simulant (Glass)

Sandstone

Arenite (composed primarily of SiO2)

Quartz Crystal

Silicon Dioxide (SiO2)

Sandstone with Concretions / Liesegang Rings

Arenite with iron oxide banding

Green Aventurine

Quartzite (variety Aventurine) with Fuchsite inclusions (K(Al,Cr)2(AlSi3O10)(OH)2)

Likely weathered quartz-bearing rock (uncertain identification)

Possibly quartz-rich granite or granitic aplite; exact identification requires a clearer, larger image and tests

Jasper (or possibly Agate/Chalcedony) beads

SiO2 (Silicon Dioxide)

Green Aventurine

Silicon Dioxide (SiO2) with Fuchsite inclusions (K(Al,Cr)2AlSi3O10(OH)2)

Sandstone

Arenite (SiO2 primarily)

Snowflake Obsidian

Volcanic Glass (spherulitic Obsidian) - SiO2 (with Cristobalite inclusions)

Amethyst

Quartz (SiO2)

Tumbled blue sodalite (probable)

Sodalite, Na₈(Al₆Si₆O₂₄)Cl₂

Chert (with Limestone and Iron Oxide staining)

Cryptocrystalline Quartz (SiO2)

Likely calcite or quartz fragment

Uncertain from image; calcite (CaCO₃) is the leading possibility, with quartz (SiO₂) another possibility

Chert Pebble with Inclusion

Microcrystalline Quartz (SiO2)

Quartz with Iron Oxide Inclusions

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Milky Quartz (Micro-specimen)

Silicon Dioxide (SiO2)

Sandstone (likely Arkose or Lithic)

Clastic sedimentary rock (SiO2 + impurities)

Sandstone (Ferruginous)

Arenite with Iron Oxides

Milky Quartz with Mica Matrix

SiO2 (Silicon Dioxide) with Muscovite/Biotite mica

Quartz with Mica inclusion

Silicon Dioxide (SiO2) with Muscovite/Biotite inclusions

Blue Aura Quartz

Silicon Dioxide (SiO2) with metallic vapor coating

Ferruginous Quartz

Iron-stained Quartz (Silicon Dioxide + Fe2O3 / FeO(OH))

Smoky quartz (rough, water-worn crystal)

Quartz, silicon dioxide (SiO₂), smoky variety

Agate Slices and Clear Quartz Points

Agate (SiO2 Chalcedony) and Clear Quartz (SiO2 Crystalline)

Chalcedony (Grey/White Agate)

Silicon Dioxide (SiO₂)

Quartz (Smoky or Impure Variety)

Silicon Dioxide (SiO2)

Green Aventurine

Silicon Dioxide (Quartz with Fuchsite inclusions) - SiO2

Green Aventurine

Aventurine Quartz (SiO2 with Fuchsite inclusions)

Chert (and Fossiliferous Chert)

Silicon Dioxide (SiO2)

Clear Quartz

Quartz (Silicon Dioxide, SiO2)

Quartz Vein with Iron Staining

Silicon Dioxide (SiO2)

Iron-Stained Quartz (Riverside Cobble)

Silicon Dioxide (SiO2) with Limonite/Hematite inclusions

Libyan Desert Glass

Libyan Desert Glass (Tektite / Impact Glass)

Quartz Pebble

Silicon Dioxide (SiO2)

Raw Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Pink Feldspar

Orthoclase (KAlSi3O8) or Microcline

Quartz

Silicon Dioxide (SiO2)

Fluorite (specifically Blue John or Banded Fluorite)

Calcium Fluoride (CaF2)

Quartz Pebble

Silicon Dioxide (SiO2)

Zirconia (Ceramic) & Ion-X Glass

Zirconium Dioxide (ZrO2) and Ion-strengthened Aluminosilicate Glass