Sedimentary (Secondary Classification: Cryptocrystalline Quartz)

Chalcedony (Agate / Quartz Pebble)

Silicon Dioxide (SiO2)

Turquoise

Turquoise — hydrated copper aluminum phosphate, CuAl₆(PO₄)₄(OH)₈·4H₂O

Blue Quartz (Blue Chalcedony/Dumortierite Quartz)

Silicon Dioxide (SiO2) with inclusions (typically Dumortierite Al7(BO3)(SiO4)3O3)

Red Jasper and Green Aventurine

Silicon dioxide (SiO2)

Limonite on Sandstone

Iron Oxyhydroxide (FeO(OH)·nH2O) on Quartz Sandstone

Chert / Flint

Cryptocrystalline Quartz (SiO2)

Chert (Flint)

Cryptocrystalline Quartz (SiO2)

Chert (Jasper/Agate)

Cryptocrystalline Quartz (SiO2)

Chert (Nodule)

Cryptocrystalline Quartz (SiO2)

Quartzite Pebble

Metamorphic Quartz-rich Rock (SiO2)

Chert / Quartz Pebble

Cryptocrystalline Quartz (SiO2)

Chalcedony Pebble

Cryptocrystalline Quartz (SiO2)

Chalcedony Pebble

Cryptocrystalline Quartz (SiO2)

Blue Chalcedony

Cryptocrystalline Quartz (SiO2)

Chalcedony (Agate/Carnelian variety)

Cryptocrystalline Quartz (SiO2)

Chert (Flint)

Cryptocrystalline Quartz (SiO2)

Blue Chalcedony (Agate)

Cryptocrystalline Quartz (SiO2)

Chalcedony (Agate/Carnelian)

Cryptocrystalline Quartz (SiO2)

Yellow Chalcedony (Agate/Chert)

Cryptocrystalline Quartz (SiO2)

Chert

Cryptocrystalline Quartz (SiO2)

Sandstone with Quartz Veining

Arenite with SiO2 veins

Chert (with Quartz Veining)

Microcrystalline silicon dioxide (SiO2)

Turquoise

Turquoise - CuAl6(PO4)4(OH)8·4H2O

Chert Arrowhead

Cryptocrystalline Quartz (SiO2)

Chert Arrowhead

Cryptocrystalline Quartz (SiO2)

Chert / Flint

Cryptocrystalline Quartz (SiO2)

Chalcedony (Agate/Carnelian)

Cryptocrystalline Quartz (SiO2)

Chalcedony

Cryptocrystalline Quartz (SiO2)

Chert (variations include Flint or Jasper)

Cryptocrystalline Quartz (SiO2)

Yellow Quartz (Chalcedony)

Silicon Dioxide (SiO2)

Jasper (yellow/cream variety)

SiO₂ (Cryptocrystalline Quartz)

Banded Agate with Drusy Quartz

Cryptocrystalline Quartz (SiO2) with macrocrystalline Quartz

Graywacke Pebble with Quartz Vein

Argillaceous Sandstone (Graywacke)

Yellow Quartz (Iron-stained Quartz)

Quartz (Silicon Dioxide, SiO2) with Hematite/Limonite impurities

Chert (Chalcedony-rich sedimentary rock)

Cryptocrystalline Quartz (SiO2)

Ferruginous Quartz

Silicon Dioxide (SiO2) with Hematite/Limonite impurities

Chrysocolla (with Malachite / Secondary Copper Minerals)

Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O

Chert (Brecciated or Veined)

Microcrystalline Quartz (SiO2)

Chert

Cryptocrystalline Quartz (SiO2)

Blue Chalcedony

Cryptocrystalline Quartz (SiO2)

Chalcedony

Cryptocrystalline Quartz (SiO2)

Flint (Chert)

Cryptocrystalline Quartz (SiO2)