Sedimentary (Microcrystalline Quartz)

Red Jasper

Jasper (Silica-rich Microcrystalline Quartz, SiO2 with Iron Oxide)

Chert (Jasper/Flint variation)

Chert (SiO2)

Dyed Chalcedony (Agate)

Silicon Dioxide (SiO2) with artificial pigment

Red Jasper (possibly Brecciated)

Jasper (Silicon Dioxide, SiO2)

Red Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Zebra Jasper

Tetragonal Silicon Dioxide (Quartz) with impurities

Agate

Chalcedony (cryptocrystalline variety of Quartz, SiO2)

Ocean Jasper

Orbicular Jasper (variety of Chalcedony/Quartz, SiO2)

Banded Calcite (often sold as 'Mexican Onyx' or 'Green Onyx')

Calcite (Calcium Carbonate, CaCO3)

Quartz Pebble (likely Chalcedony or Quartzite)

Silicon Dioxide (SiO2)

Yellow Quartzite (Onyx Pebble)

Silicon Dioxide (SiO2) - Quartzite

Carnelian

Carnelian (Cryptocrystalline Quartz, SiO2)

Red Jasper (with inclusions)

Silicon Dioxide (SiO2) with Hematite impurities

Red Jasper (River Pebble)

Jasper (Silicon Dioxide, SiO2)

Chert (Jasper variety)

Silicon Dioxide (SiO2)

Red Jasper

Silicon Dioxide (SiO2) with Hematite (Fe2O3) inclusions

Red Jasper

Silicon Dioxide (SiO2) with Hematite (Fe2O3) impurities

Jasper or Chert

Silicon Dioxide (SiO2)

Red Jasper (Chert)

Silicon Dioxide (SiO2) with iron oxide inclusions

Chert (specifically Flint or Jasper variant)

Chert (Siliceous rock composed of microcrystalline Quartz, SiO2)

Chert Pebble (with Quartz Vein)

Chert (Cryptocrystalline Silica - SiO2)

Blue Lace Agate

Cryptocrystalline Quartz (SiO2) with trace minerals

Banded Agate (specifically Lake Superior Agate or similar)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Chert (Flint)

Chert (Cryptocrystalline variety of Quartz, SiO2)

Quartz Vein in Host Rock

Silicon Dioxide (SiO2) in Rhyolitic Matrix

Red Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

Agate (Carnelian-Blue Agate mix)

Silicon Dioxide (SiO2)

Snakeskin Agate

Agate (Cryptocrystalline Quartz, SiO2)

Imperial Jasper

Silicon Dioxide (SiO2) - Microcrystalline Quartz with Mineral Inclusions

Jasper

Jasper (Silica/Quartz) - SiO2

Yellow Jasper / Chert

Jasper (Silica/Quartz) - SiO2

Agate Slices and Clear Quartz Points

Agate (SiO2 Chalcedony) and Clear Quartz (SiO2 Crystalline)

Quartzite

Metamorphosed Quartz Sandstone (SiO2)

Chert (specifically Tan Chert)

Chert (SiO2)

Banded Agate (River Stone)

Agate (Silicon Dioxide - SiO2)

Red Jasper

Jasper (Silicon Dioxide with iron oxide inclusions), SiO2

Chert (Tan/Grey)

Chert (Silicon Dioxide, SiO2)

Red Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

Zebra Jasper

Silicon dioxide (SiO2) with various impurities

Yellow Jasper

Jasper (Silicon Dioxide, SiO2)

Dalmatian Stone

Peralkaline rhyolite

Zebra Jasper

Jasper (variety of Quartz/Chalcedony), SiO2