Organic (Non Rock)

Chert Pebble (with Quartz Vein)

Chert (Cryptocrystalline Silica - SiO2)

Chert (specifically Green Chert/Jasper)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Chert / Flint

Cryptocrystalline Quartz (Silicon Dioxide, SiO2)

Crushed Limestone

Calcite-rich Sedimentary Rock (CaCO3)

Petrified Wood

Silicified wood (primarily Silicon Dioxide - SiO2)

Petrified Wood

Silicified Wood (primarily SiO2 - Silicon Dioxide)

Petrified Wood

Silicified Wood (SiO2)

Chert (Iron-stained)

Microcrystalline Quartz (SiO2)

Moss Agate

Chalcedony (SiO2) with dendritic inclusions of Manganese or Iron oxide

Coquina

Biogenic Limestone (Calcium Carbonate, CaCO3)

Chert / Quartz Pebble

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Banded Chert (or Flint)

Microcrystalline Quartz (SiO2)

Epidote with Feldspar/Quartz (Unakite-like)

Epidotized Granite (Ca2(Al,Fe)3(SiO4)3(OH) + KAlSi3O8)

Petrified Wood

Silicified Wood (SiO2)

Chert (Arrowhead or Projectile Point)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Green variety)

Microcrystalline Opaline/Quartz (SiO2)

Chert (includes Flint & Jasper)

Chert (Siliceous sedimentary rock, chemical formula SiO2)

Petrified Wood

Silicified Wood (primarily Quartz / Chalcedony: SiO2)

Amber

Succinite (with formula approximately C10H16O)

Petrified Wood

Silicified Wood (SiO2 - Silicon Dioxide)

Zebra Rock (Zebra Stone / Ribbon Stone)

Siltstone with Ferruginous Banding (Primarily Quartz, Kaolinite, and Hematite)

Bituminous Coal

Organic Sedimentary Rock (composed mostly of carbon with sulfur and hydrogen)

Green Moss Agate

Silicon Dioxide (SiO2) with inclusions of hornblende or chlorite

Chert (Yellow Jasper variant)

Microcrystalline Quartz (SiO2)

Chert (Nodule / Geode fragment)

Microcrystalline Quartz (SiO2)

Petrified Wood

Silicified Wood (SiO2)

Chert / River Pebble

Microcrystalline Silica (SiO2)

Moss Agate

Silicon Dioxide (SiO2) with inclusions of manganese or iron oxides

Chert (Iron-stained)

Microcrystalline Quartz (SiO2)

Chert (Quartz Pebble)

Silicon Dioxide (SiO2)

Petrified Wood

Silicified wood (Quartz/Chalcedony - SiO2)

Blue Agate (Tumbled and Dyed)

Silicon Dioxide (SiO2) with likely organic dyes

Graphite-veined Quartzite

Meta-sedimentary Quartzite with Carbonaceous/Graphitic Inclusions (SiO2 + C)

Chert (Quartz Variety)

Silicon Dioxide (SiO2)

Synthetic Resin Charm (Seal Shape)

Polymer Resin with plastic glitter / Polyethylene terephthalate glitters

Petrified Wood

Silicified Wood (SiO2)

Amethyst Sage Agate

Silicon Dioxide (SiO2) with trace minerals (Manganese/Iron oxides)

Chert (Nodular)

Chert (SiO2 - Microcrystalline Quartz)

Fossiliferous Brachiopod in Shale

Brachiopoda (Phylum) preserved in Carbonaceous Shale

Quartz Geode in Chert/Limestone Matrix

Silicon Dioxide (SiO2) within Sedimentary Host Rock

Chalcanthite (Likely Synthetic/Lab-Grown)

Hydrated copper(II) sulfate (CuSO4·5H2O)

Banded Chert (Ironstone/Jasper)

Cryptocrystalline Quartz (SiO2) with Iron Oxides