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

Tumbled carnelian (probable)

Chalcedony, microcrystalline quartz (SiO₂), orange iron-oxide variety

Red jasper pebble (probable)

Jasper; microcrystalline quartz (SiO₂) colored mainly by iron oxides

Blue Chalcedony

Silicon Dioxide (SiO2)

Red Jasper

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Agate

Agate (Chalcedony), SiO2

Blue Lace Agate (Geode/Druzy variant)

Chalcedony (SiO2) with Quartz druzy

Beach Pebble (likely Quartz or Chalcedony)

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Chert

Microcrystalline quartz (SiO2)

Tumbled jasper, likely mookaite or brecciated jasper

Microcrystalline quartz (SiO₂), with iron-oxide inclusions

Dendritic agate or included chalcedony (likely tumbled)

Microcrystalline quartz, SiO₂; inclusions likely manganese-oxide dendrites or iron minerals

Orange cabochon ring

Possibly carnelian (microcrystalline quartz, SiO₂); identification from the photograph is uncertain.

Gray chalcedony (microcrystalline quartz)

Chalcedony, SiO₂; likely common gray/blue-gray variety

Jasper

Jasper (Cryptocrystalline variety of Quartz, SiO2)

Botryoidal Chalcedony

Silicon Dioxide (SiO2)

Chert (Jasper variety)

Chert (SiO2)

Agate Geode Node

Cryptocrystalline Quartz (SiO2)

Tumbled red jasper with a quartz vein

Jasper (microcrystalline quartz, SiO₂), likely crossed by milky quartz

Agate (specifically Moss or Plume Agate nodding toward Agatized Wood)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz (Chalcedony)

Quartz

Quartz (SiO₂ - Silicon Dioxide)

Dalmatian jasper (polished stone beads)

Commercial “Dalmatian jasper”; typically a feldspar-rich rock with dark aegirine or arfvedsonite inclusions, not true jasper

Tumbled chalcedony (likely agate or jasper)

Microcrystalline quartz, SiO₂ (chalcedony)

Tumbled agate/chalcedony

Microcrystalline quartz (SiO₂), likely banded chalcedony or agate

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Tumbled amber-colored chalcedony (likely carnelian)

Quartz, microcrystalline SiO₂; orange variety commonly called carnelian

Carnelian

Carnelian (Silicon Dioxide, SiO2)

Polished red jasper

Jasper, microcrystalline quartz (SiO₂), colored chiefly by iron oxides

Yellow Jasper

Silicon Dioxide (SiO2) with iron inclusions

Yellow Jasper

Silicon Dioxide (SiO2) with iron inclusions

Tumbled blue chalcedony (likely blue lace agate)

Microcrystalline quartz, SiO₂; chalcedony with possible agate banding

Tumbled agate or chalcedony pebble

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

Chert (Chalcedony/Agate variety)

Microcrystalline Quartz (SiO2)

Polished blue-gray agate/geode slice (tentative)

Microcrystalline quartz (chalcedony), SiO₂, possibly with druzy quartz

Chalcedony (Agate / Quartz Pebble)

Silicon Dioxide (SiO2)

Red Jasper

Jasper (Silicon Dioxide, SiO2)

Tumbled chalcedony (likely milky agate)

Microcrystalline quartz, SiO₂; chalcedony/agate variety

Banded Agate (specifically Mexican Lace Agate variety appearance)

Silicon Dioxide (SiO2 / Chalcedony)

Polished yellow chalcedony (likely lemon agate or yellow jasper)

Microcrystalline quartz, SiO₂

Yellow jasper (likely iron-stained chert or quartzite)

Microcrystalline quartz, SiO₂, colored by iron oxides/hydroxides