Sedimentary (Cryptocrystalline Quartz)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Quartz Vein in Host Rock

Quartz (SiO2) in Mafic or Sedimentary Matrix

Mixed Chalcedony and Jasper Bracelet (possibly 'Ocean Jasper' or similar banded variety for brown beads, and blue/grey Chalcedony for the translucent beads)

Chalcedony (SiO2), Jasper (SiO2 with impurities)

Mica Schist with Quartz

Mica-Quartz Schist (Muscovite subclass)

Dendritic Agate

Silicon Dioxide with Manganese or Iron Oxide inclusions (SiO2 + Mn/Fe)

Chert (and/or Chalcedony)

Silicon dioxide (SiO2)

Plume Agate

Silicon Dioxide (SiO2)

Quartz / Common Opal

Silicon Dioxide (SiO2)

Ferruginous Quartz (Iron-stained Quartz)

Silicon Dioxide (SiO2) with Hematite/Goethite inclusions

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Quartz (Milky or White Quartz)

Silicon Dioxide (SiO2)

Sand (Construction Grade)

Unconsolidated siliciclastic sediment (primarily SiO2)

Onyx Marble (also commonly called Onyx)

Calcite (CaCO3), often with other mineral impurities

Carnelian Agate

Silicon Dioxide (SiO2)

Agate / Banded Chalcedony

Agate (Silicon Dioxide / SiO2)

Green Aventurine

Silicon dioxide (SiO2) with fuchsite inclusions

Quartz

Silicon Dioxide (SiO₂)

Agate

Silicon Dioxide (SiO2) - variety: Chalcedony

Banded Agate (Agatized Geode Slice)

Silicon Dioxide (SiO₂)

Quartz Geode/Druzy Quartz

Quartz (SiO₂)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Quartz (Milky or White Quartz)

Silicon Dioxide (SiO2)

Carnelian

Carnelian (a variety of Chalcedony, SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Quartz (Silicon Dioxide, SiO2)

Clear Quartz

Quartz (Silicon Dioxide, SiO2)

Sand Grain (Silica/Quartz Grain)

Silicon Dioxide (SiO2)

Yellow Quartz (Citrine/Yellow Jasper)

Silicon Dioxide (SiO2)

Jasper (Banded Jasper)

Silicon Dioxide (SiO2) with impurities

Chert (Jasper variety)

Silicon Dioxide (SiO2)

Dyed Agate

Silicon Dioxide (SiO2)

Chert (Flint)

Silicon Dioxide (SiO2)

Red Jasper

Silicon dioxide (SiO2) with iron oxide inclusions

Quartz

Silicon dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Chert (with Limestone matrix)

Chert (Silica: SiO2)

Agate (Chert/Chalcedony)

Silicon Dioxide (SiO2)

Jasper (Iron-stained Chalcedony)

SiO2 with Fe2O3 (Iron Oxide) impurities

Sandstone Geode (Unbroken)

Siliciclastic sedimentary rock (primarily Quartz)

Sandstone (with Iron Staining)

Clastic Sedimentary Rock (primarily Quartz, SiO2)

Conglomerate with Quartzite Pebbles

Clastic sedimentary rock (Conglomerate)