Mineral (Chalcedony)

Jasper

SiO2 (Cryptocrystalline quartz)

Chalcedony

Silicon Dioxide (SiO2)

Likely polished agate or chalcedony pebble

Chalcedony, microcrystalline quartz (SiO₂); exact variety cannot be confirmed from the image

Chalcedony

Chalcedony (SiO2)

Chalcedony (variations like Agate or Jasper)

Chalcedony (SiO₂ - microcrystalline quartz)

Chalcedony

Silicon Dioxide (SiO2)

Chalcedony

Chalcedony (SiO2)

Tumbled chalcedony/agate (likely iron-stained quartz)

Microcrystalline quartz, SiO₂; chalcedony with possible agate banding and iron-oxide inclusions

Tumbled yellow chalcedony (likely citrine or yellow jasper)

Microcrystalline quartz, SiO₂; possibly iron-stained chalcedony

Chalcedony Geode Fragment

Silicon Dioxide (SiO2)

Chalcedony (Banded/Mottled Variety)

Chalcedony (a cryptocrystalline variety of Quartz, SiO2)

Chalcedony

Chalcedony (SiO2)

Chalcedony

Silicon Dioxide (SiO2)

Blue Chalcedony

Chalcedony (SiO2)

Chalcedony (Botryoidal or Chalcedony Rose)

Silicon dioxide (SiO2)

Blue Agate (Dyed or Treated Chalcedony)

Silicon Dioxide (SiO2), microcrystalline quartz variety

Tumbled agate or chalcedony

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

Polished agate/jasper pebble

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

Polished carnelian/chalcedony

Microcrystalline quartz (SiO₂), likely iron-stained chalcedony

Tumbled yellow jasper or chalcedony

Microcrystalline quartz, SiO₂; likely iron-oxide-bearing jasper/chalcedony

Chalcedony (Common Opal variant or Agate pebble)

Silicon dioxide (SiO2)

Tumbled amber-colored chalcedony or jasper

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

Honey-colored chalcedony (likely carnelian)

Microcrystalline quartz, SiO₂; orange chalcedony colored by iron oxides

Orange chalcedony or tumbled carnelian fragment

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

Chalcedony

Silicon dioxide (SiO2)

Chalcedony

Silicon Dioxide (SiO2)

Chalcedony

Silicon Dioxide (SiO2)

Chalcedony

Silicon Dioxide (SiO2)

Chalcedony

Silicon Dioxide (SiO2)

Chalcedony

Silicon Dioxide (SiO2)

Chalcedony (likely carnelian/agate beads or rounded grains)

Microcrystalline quartz, SiO₂; chalcedony varieties

Chalcedony

Silicon Dioxide (SiO2)

Chalcedony

SiO2 (Silicon Dioxide)

Chalcedony

Silicon Dioxide (SiO2)

Chalcedony

Chalcedony (SiO₂)

Chalcedony

Silicon Dioxide (SiO₂)

Small reddish-brown pebble, possibly jasper or iron-stained quartz

Unidentified silica-rich pebble; visual identification is insufficient to distinguish jasper, quartz, or another material

Botryoidal Chalcedony with Calcite

Chalcedony (SiO2 with accessory minerals, likely CaCO3)

Blue Chalcedony

Silicon Dioxide (SiO2)

Tumbled agate/chalcedony

Microcrystalline quartz (SiO₂), likely banded chalcedony or agate

Botryoidal chalcedony/geode fragment

Microcrystalline quartz (SiO₂), likely chalcedony with druzy quartz; exact identification requires testing

Tumbled chalcedony (likely milky agate)

Microcrystalline quartz, SiO₂ (chalcedony)