Sedimentary Rock (Possibly Conglomerate Or Breccia With A Quartz Vein)

Yellow Jasper

Silicon Dioxide (SiO2) with Goethite/Iron oxide inclusions

Sandstone (likely Arkosic or Lithic)

Clastic Sedimentary Rock (SiO2 with accessory minerals)

Crystal Quartz Beads (likely Clear Quartz)

Quartz (SiO₂)

Amethyst Quartz

Amethyst (SiO2 with Iron impurities)

Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Sandstone (specifically an Iron-Concretion)

Arenite with Iron Oxide (Limonite/Goethite) cementation

Geode with Iron-Stained Quartz/Calcite

Silicon Dioxide (SiO2) or Calcium Carbonate (CaCO3) in Sedimentary Matrix

Yellow Jasper

Jasper (Silicon Dioxide, SiO2)

Chert (often called Flint or Jasper depending on color)

Chert (SiO2 - Microcrystalline or Cryptocrystalline Quartz)

Citrine

SiO2 (Silicon Dioxide)

Druzy Quartz on Agate/Chert

Silicon Dioxide (SiO2)

Iron-stained Quartz

Silicon Dioxide with Iron Oxide (SiO2 + Fe2O3/FeO(OH))

Pyrite (on host rock/ore)

Iron Sulfide (FeS2)

Chert Nodule (Flint)

Chert (Cryptocrystalline Silica - SiO2)

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Ruby in Kyanite

Al2O3 (Corundum) in Al2SiO5 (Kyanite-Fuchsite-Quartz)

Quartz (Common or Milky)

Silicon Dioxide (SiO2)

Petrified Wood

Silicified Wood (SiO2)

Quartz (Citrine or Iron-Stained variety)

Silicon Dioxide (SiO2)

Terrazzo (Man-made Composite)

Cementitious or Resin-bound Lithic Composite

Quartz (Variety: Citrine or Tumbled Chalcedony)

Silicon Dioxide (SiO2)

Banded Gneiss

Gneiss (Metamorphic Rock)

Red Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Chert (Jasper/Agate variety)

Silicon Dioxide (SiO2)

River Stone / Pebble

Clastic Sediment (composed largely of Quartz, Feldspar, and various rock fragments)

Chert Pebble (Jasper variant)

Microcrystalline Quartz (SiO2)

Yellow Chert (Gold-toned Jasper)

Silicon Dioxide (SiO2)

Jasper

Jasper (Silica/Quartz) - SiO2

Chert / Flint Nodule

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Sandstone (Ferruginous)

Arenite (with high iron oxide content)

Sandstone (Ferruginous)

Arenite (primarily SiO2 with iron oxide staining/cementing)

Red Jasper (Chert)

Silicon Dioxide (SiO2)

Agate (specifically Carnelian Agate or Lake Superior style Agate)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Jasper in Quartz (River Cobble)

Silicon Dioxide (SiO2) with Ferric Iron inclusions

Sandstone (Red Sandstone)

Clastic Sedimentary Rock (primarily SiO2 with Iron Oxide)

Sandstone (Quartzite-rich Pebble)

Arenite (composed primarily of SiO2)

Green Fluorite

Fluorite (Calcium Fluoride) - CaF2

Gneiss (Banded Gneiss)

Gneiss

River Stone (Chert/Siltstone)

Cryptocrystalline Quartz (SiO2) with trace impurities

Chert (Nodule/Pebble)

Chert (Silicon Dioxide, SiO2)

Gneiss

Gneiss (High-grade regional metamorphic rock)

Petrified Wood

Silicified Wood (primarily SiO2)