Sedimentary (Silicified Fossiliferous Chalcedony)

Tiger's Eye

SiO2 (Quartz with inclusion of iron oxides)

Orca Agate (Blue Chalcedony)

Silicon Dioxide (SiO2)

Chrysoprase

Nickel-bearing Chalcedony (SiO2 with Ni impurities)

Red Jasper

Silicon Dioxide with Iron Oxide inclusions (SiO2 + Fe2O3)

Dragon Vein Agate

Silicon Dioxide (SiO2)

Moss Agate

Silicon Dioxide with inclusions (SiO2 + impurities)

Banded Calcite (often commercially called 'Mexican Onyx')

Calcium Carbonate (CaCO3)

Banded Agate (specifically Botryoidal/Orbicular Agate)

Silicon Dioxide (SiO2)

Carnelian Agate

Red Chalcedony (SiO2 with Iron Oxide impurities)

Banded Agate Geode (with Microcrystalline Quartz)

Silicon Dioxide (SiO2) - variety Chalcedony/Agate

Ocean Jasper (Orbicular Jasper)

Silicon Dioxide (SiO2) - Variety of Chalcedony/Quartz

Carnelian Agate

Silicon Dioxide (SiO2) - Carnelian variety of Chalcedony

Chrysoprase

Chalcedony (cryptocrystalline quartz) with nickel inclusions; SiO2

Banded Agate (specifically Sardonyx or Black Agate variety)

Silicon Dioxide (SiO2) - Chalcedony / Cryptocrystalline Quartz

Moss Agate

Chalcedony (SiO2) with inclusions of manganese or iron oxides

Carnelian

SiO2 (Silicon Dioxide) - Carnelian variety of Chalcedony

Moss Agate

Chalcedony (Silicon Dioxide) with dendritic inclusions (SiO2)

Carnelian Agate

Silicon Dioxide (SiO2) - variety Carnelian (Chalcedony)

Carnelian

SiO2 (Silicon Dioxide) - Carnelian Agate/Chalcedony

Fire Agate

Chalcedony (Silicon Dioxide, SiO2) with Limonite/Goethite

Pink Banded Agate (Dyed)

Chalcedony (cryptocrystalline silica), chemical formula SiO2

Dalmatian Jasper

Peralkaline rock with Tourmaline spots

Indian Agate

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Chrysocolla

Chrysocolla (Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O)

Blue Lace Agate (Banded Chalcedony)

Silicon Dioxide (SiO₂)

Banded Agate (likely Carnelian Agate or Sardonyx)

Agate is a common name for a microcrystalline variety of Quartz (SiO₂), specifically a form of Chalcedony.

African Turquoise (Jasper)

Polychrome African Jasper (often marketed as 'African Turquoise' due to its color, but it is not true turquoise)

Quartz (likely Yellow/Orange variety, possibly Citrine or Chalcedony with iron staining)

Quartz (SiO₂)

Amethyst Sage Agate

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

Pink Jade (Dyed Quartzite)

Silicon Dioxide (SiO2) - primarily Quartzite or Quartz

Jasper (Green/Yellow Moss Jasper)

Silicon Dioxide (SiO2)

Banded Chert / Banded Jasper (likely a variety of Chert/Chalcedony)

Chert (microcrystalline quartz)

Moss Agate

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

Blue Agate (Dyed Chalcedony)

Silicon Dioxide (SiO2)

Heat-Treated Citrine (Amethyst Cathedral with Agate inclusions)

Silicon Dioxide (SiO2) with iron impurities

Red Swirl Beads (Likely Resin or Glass, simulating Red Jasper or Agate)

N/A (for the beads as pictured); Red Jasper: SiO2 (Chert variety); Red Agate: SiO2 (Chalcedony variety)

Blue Quartz (specifically Dumortierite Quartz)

SiO2 (Silicon Dioxide) with inclusions of AlAl6BSi3O18 (Dumortierite)

Nephrite Jade

Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2)

Quartz

Quartz (SiO₂ - Silicon Dioxide)

Tiffany Stone

Bertrandite (with Fluorite, Opal, and Chalcedony), Be4Si2O7(OH)2

Tumbled Stones (various)

Mixed Silica-based Minerals (primarily Quartz and Chalcedony)

Carnelian Agate

Chalcedony (Silicon Dioxide, SiO2) with Iron Oxide impurities