Mineral (Specifically A Variety Of Chalcedony, Which Is Microcrystalline Quartz)

Blue Banded Agate (Dyed)

Silicon Dioxide (SiO2) - Chalcedony variety

Milky Quartz or Moonstone

Silicon Dioxide (SiO2) or Potassium Aluminum Silicate (KAlSi3O8)

Red jasper (likely brecciated or orbicular jasper)

Microcrystalline quartz, SiO₂, colored mainly by iron oxides

Brecciated jasper (likely ocean jasper or red jasper)

Microcrystalline quartz, SiO₂, with iron-oxide pigments and breccia cement

Blue Chalcedony

Silicon Dioxide (SiO2)

Agate Geode Nodule

Chalcedony / Quartz (SiO2)

Tumbled jasper or chalcedony pebble

Microcrystalline quartz, SiO₂ (likely jasper/chalcedony)

Polished jasper pebble

Microcrystalline quartz (chalcedony), SiO₂, with iron-oxide inclusions

Yellow Agate

Silicon Dioxide (Chalcedony variety), SiO2

Tumbled amber-colored chalcedony or jasper

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

Agate (specifically crazy lace agate / orbicular agate node)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Chalcedony in Matrix

Silicon Dioxide (SiO2)

Tumbled banded agate

Chalcedony (microcrystalline quartz), SiO₂

Geode

Quartz / Chalcedony nodule

Tumbled orange chalcedony or carnelian

Microcrystalline quartz (SiO₂), likely iron-stained chalcedony

Tumbled jasper (likely)

Microcrystalline quartz, SiO₂; likely jasper, a variety of chalcedony

Tumbled orange chalcedony (likely carnelian)

Microcrystalline quartz, SiO₂; iron-bearing variety commonly termed carnelian

Honey-colored chalcedony (likely carnelian)

Microcrystalline quartz, SiO₂; orange chalcedony colored by iron oxides

Tumbled gray-blue agate/chalcedony

Microcrystalline quartz (SiO₂), likely banded chalcedony or agate

Green Chalcedony (likely Green Agate or Chrysoprase)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Tumbled brown agate (possible carnelian or chalcedony)

Microcrystalline quartz, SiO₂; agate is banded chalcedony

Jasper (likely brecciated jasper)

Microcrystalline quartz, SiO₂, colored by iron oxides

Polished chalcedony (likely moss or dendritic agate)

Microcrystalline quartz, SiO₂, with iron/manganese oxide inclusions

Red Jasper with Quartz

Microcrystalline Quartz (SiO2)

Chrysocolla in Quartz

Chrysocolla (Cu,Al)2H2Si2O5(OH)4·nH2O in Quartz (SiO2)

Chert (specifically Jasper)

Silicon dioxide (SiO2) with iron oxide inclusions

Tumbled chalcedony (likely agate or jasper fragment)

Microcrystalline quartz, SiO₂ (chalcedony)

Tumbled yellow-orange chalcedony (likely carnelian)

Microcrystalline quartz, SiO₂; iron-bearing variety commonly called carnelian

Likely polished agate beads

Agate, a banded variety of chalcedony (microcrystalline SiO₂); exact identification is uncertain from the image

Tumbled red-and-cream jasper

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

Tumbled jasper, likely red/brown jasper

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

Polished orange agate beads

Chalcedony, microcrystalline quartz (SiO₂), commonly sold as agate

Unakite

Epidote-Feldspar rock (specifically, a variety of granite)

Chalcedony (variations like Agate or Jasper)

Chalcedony (SiO₂ - microcrystalline quartz)

Chert (Jasper variety)

Chert (SiO2)

Dyed Agate Geode

Silicon Dioxide (SiO2) - Chalcedony variety

Agate Nodule (partially vuggy Quartz)

Silicon Dioxide (SiO2)

Chert (or Flint)

SiO2 (predominantly microcrystalline quartz)

Tumbled carnelian (likely)

Carnelian, orange-red variety of cryptocrystalline silica (SiO₂), chalcedony

Quartz (specifically Milky or Clear Quartz fragment)

Silicon Dioxide (SiO2)

Banded Jasper

Silicate Mineral (Microcrystalline Quartz / SiO2)

Tumbled purple agate (likely amethyst-bearing agate)

Banded chalcedony, a microcrystalline variety of quartz (SiO₂); exact identification is uncertain from the image