Sedimentary Rock (Technically A Variety Of Chalcedony)

Chalcedony (Banded/Mottled Variety)

Chalcedony (a cryptocrystalline variety of Quartz, SiO2)

Jasper

Silicon dioxide (SiO2) with iron impurities

Agate

Silicon Dioxide (SiO2)

Milky chalcedony cabochon ring

Chalcedony, microcrystalline quartz (SiO₂), likely white or pale agate variety

Tumbled brown chalcedony (likely chert or agate)

Microcrystalline quartz, SiO₂ (chalcedony); exact variety is uncertain from the image

Jasper Pendant

Chalcedony (Quartz) - SiO2

Tumbled jasper or weathered chert

Microcrystalline quartz (SiO₂), likely jasper/chert with iron-oxide impurities

Banded Agate (Orca Agate)

Silicon Dioxide (SiO2) - Chalcedony variety

Red jasper

Microcrystalline quartz (chalcedony), SiO₂, colored mainly by iron oxides

Red jasper (likely brecciated jasper)

Microcrystalline quartz/chalcedony, SiO₂, colored mainly by iron oxides

Flint or chert pebble

Microcrystalline quartz (SiO₂), commonly called chert or flint

Polished orange agate (likely carnelian)

Chalcedony, microcrystalline quartz (SiO₂); orange-red variety commonly called carnelian

Tumbled carnelian

Carnelian, orange-red chalcedony (microcrystalline SiO₂)

Tumbled red-brown chert or jasper

Microcrystalline quartz (SiO₂), likely iron-stained chert/jasper

Jasper (specifically Red Jasper or Iron-stained Chert)

Silicon dioxide (SiO2) with iron oxide inclusions

Red Jasper

Microcrystalline Quartz (SiO2 with Iron Oxide impurities)

Jasper

Silicon dioxide (SiO2) with impurities

Jasper

Microcrystalline Quartz (SiO2)

Red Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

Jasper (Iron-rich)

Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) impurities

Agate

Silicon Dioxide (Chalcedony), SiO2

Quartz (Chert/Chalcedony variety)

Silicon Dioxide (SiO2)

Polished banded agate (likely sardonyx)

Cryptocrystalline chalcedony, SiO₂; reddish bands are iron-stained layers

Dendritic Agate

Silicon Dioxide (SiO2) with Manganese/Iron oxide inclusions

Tumbled orange-brown jasper

Microcrystalline quartz (chalcedony), SiO₂, colored by iron oxides

Jasper

Silicon dioxide / Chalcedony (SiO2)

Red Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

Pink Dyed Agate

Silicon Dioxide (SiO2) - Variety Agate

Yellow Jasper

Jasper (Silicon Dioxide, SiO2 with iron inclusions)

Red Jasper

Jasper (Silicon Dioxide) - SiO2

Dalmatian Jasper

Peralkaline Quartz-Feldspar Rock with Arfvedsonite

Yellow Jasper

Silicon Dioxide with iron inclusions (SiO2)

Yellow Jasper

Chalcedony (Silicon Dioxide, SiO2)

Banded Agate (specifically Carnelian Agate)

Silicon Dioxide (SiO2) - Chalcedony variety

Red-and-black jasper

Jasper, an opaque microcrystalline quartz variety (SiO₂), colored by iron oxides

Chert (Chalcedony-rich sedimentary rock)

Cryptocrystalline Quartz (SiO2)

Orange-pink chalcedony (likely carnelian/chalcedony rough)

Microcrystalline quartz, SiO₂; iron-oxide-bearing chalcedony

Carnelian

Carnelian (a variety of Chalcedony, SiO ₂)

Chalcedony (variations like Agate or Jasper)

Chalcedony (SiO₂ - microcrystalline quartz)

Chalcedony

Silicon dioxide (SiO2) - Cryptocrystalline Quartz

Quartz pebble (Agate / Chalcedony)

Silicon Dioxide (SiO2)

Carnelian (a variety of Chalcedony)

Silicon Dioxide (SiO2) with iron oxide impurities