Anthropogenic Specimen (Man Made Material)

Chert (Pebble)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Sandstone (likely Graywacke or Arkose variant)

Clastic Sedimentary Rock (SiO2 based)

Sandstone

Arenite (primarily SiO2)

Sandstone (Quartzose Sandstone)

Arenite

Sandstone (likely Arkosic or Lithic)

Clastic Sedimentary Rock (SiO2 with accessory minerals)

Sandstone (Ferruginous)

Arenite (primarily SiO2 with Fe2O3 staining)

Sandstone (Quartz-rich)

Clastic sedimentary rock (SiO2 primary)

Pyrite

Iron Sulfide (FeS2)

Chrysocolla on Quartz/Rhyolite matrix

Hydrated copper phyllosilicate mineral: (Cu,Al)2H2Si2O5(OH)4·nH2O

Beaded Jewelry (Assorted Gemstones)

Various minerals, including but not limited to Quartz (SiO2), Garnet (X3Y2(SiO4)3), Jade (Na(Al,Fe)Si2O6), Amethyst (SiO2),等の多様な組み合わせ

Sandstone (Ferruginous)

Ferruginous Sandstone (SiO2 with Fe2O3)

Sea Glass (Frosted Glass)

Amorphous Silica (SiO2) with various metal oxide impurities

Chert (Yellow Jasper variant)

Microcrystalline Quartz (SiO2)

Chert Pebble

Microcrystalline or cryptocrystalline Quartz (SiO2)

Quartz Crystal Cluster

Quartz (Silicon Dioxide, SiO2)

Quartzite River Cobble

Quartzite (primarily SiO2)

Pink Quartz (Rose Quartz)

Silicon Dioxide (SiO2)

Quartzite (River Cobble)

Metamorphosed Quartz Sandstone (SiO2)

Granite (Pink/Potassium Feldspar Granite)

Felsic Plutonic Rock (Potassium Feldspar, Quartz, Mica, and Amphibole)

Smoky Quartz

Smoky Quartz (SiO2)

Sandstone Pebble

Arenite (primarily Quartz, SiO2)

Chert (Flint)

Silicon Dioxide (SiO2)

Sandstone (Ferruginous)

Arenite (with high iron oxide content)

Travertine (Tufa)

Chemical Sedimentary Limestone (CaCO3)

Basalt

Basalt (Mafic volcanic rock)

Chert Pebble (Yellow/Brown Jasper variety)

Microcrystalline Quartz (SiO2)

Lapis Lazuli

Lapis Lazuli (a rock, not a single mineral; primary mineral is Lazurite (Na,Ca)8(AlSiO4)6(S,SO4,Cl)1-2

Petrified Wood

Silicified Wood (primarily SiO₂ / Silicon Dioxide)

Milky Quartz (Water-worn Pebble)

Silicon Dioxide (SiO2)

Chert (Yellow Jasper/Flint)

Silicon Dioxide (SiO2)

Banded Chert (Flint)

Microcrystalline Quartz (SiO2)

Granodiorite

Granodiorite (Intermediate intrusive igneous rock)

Quartz

Silicon Dioxide (SiO2)

Chert (Yellow Jasper variant)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Diorite (Salt and Pepper Rock)

Diorite (comprising Plagioclase Feldspar, Hornblende, and Biotite)

Siltstone or Mudstone

Argillaceous sedimentary rock

Quartzite

Quartzite (primarily SiO2)

Iron-stained Quartz

Silicon Dioxide (SiO2) with Hematite/Limonite impurities

Diamond

Diamond (pure carbon, C)

Diabase (Greenstone)

Diabase (Dolerite)

Quartz Pebble (Iron-Stained)

Silicon Dioxide (SiO2)

Chert (often found as Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)