Sedimentary (Secondary Classification: Cryptocrystalline Quartz)

Jasper

Silicon Dioxide (SiO2)

Sandstone

Arenite

Quartz

Silicon Dioxide (SiO2)

Crystal Quartz Beads (likely Clear Quartz)

Quartz (SiO₂)

Sandstone (with Iron Staining)

Clastic sedimentary rock (primarily Quartz with Limonite/Goethite staining)

Quartz (likely Milky Quartz or Chalcedony)

Quartz (SiO2 - Silicon Dioxide)

Milky Quartz

Quartz (Silica / Silicon Dioxide), SiO2

Orbicular Jasper (Ocean Jasper variant)

Silicon Dioxide (SiO2) with iron oxide inclusions

Green Jasper

Jasper (Silicon Dioxide, SiO2)

Banded Chert

Silicon Dioxide (SiO2)

Agate

Silicon Dioxide (SiO2) - Banded Chalcedony

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Quartz-veined Sedimentary Rock

Hydrothermally veined Clastic Sedimentary Rock (SiO2 veins in Matrix)

Pyrite (on host rock)

Iron Sulfide (FeS2)

Blue Chalcedony

Silicon Dioxide (SiO2)

Common Opal in Host Rock

Hydrated Silica (SiO2·nH2O)

Quartz (Milky/Bull Quartz)

Silicon Dioxide (SiO2)

Clear Quartz Cluster

Quartz (Silicon Dioxide - SiO2)

Chalcedony (Agate)

Silicon Dioxide (SiO2)

Chert (Flint variety)

Chert (SiO2)

Carnelian (Chalcedony)

Silicon Dioxide (SiO2)

Chert (Flint variety)

Silicon Dioxide (SiO2)

Jasper (Chert)

Silicon Dioxide (SiO2)

Clear Quartz (beads in a bracelet)

Quartz (SiO2)

Quartz

Quartz (Silicon Dioxide, SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Quartz (likely Clear Quartz or Rock Crystal)

Quartz (SiO2)

Chert (Nodular)

Microcrystalline Silica (SiO2)

Chert (Flint)

Silicon Dioxide (SiO2)

Polished Chert (Flint)

Silicon Dioxide (SiO2)

Jasper (Green variety)

Silicon Dioxide (SiO₂)

Chert (Black Chert/Flint)

Silicon Dioxide (SiO2)

Chert (Quartzite-rich River Pebble)

Silicon Dioxide (SiO2)

Chert (Nodule)

Silicon Dioxide (SiO2)

Chert (Chalcedony)

Silicon Dioxide (SiO2)

Chert (Yellow Jasper/Flint)

Silicon Dioxide (SiO2)

Petrified Wood

Silicified Wood (primarily SiO2)

Chert (Field Stone)

Chert (Silicon Dioxide, SiO2)

Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Chert / Flint

Silicon Dioxide (SiO2)

Chert (Flint)

Chert (Silicon Dioxide, SiO2)

Chert (Grey-Green Var.)

Silicon Dioxide (SiO2)