Mineral (Variety Of Chalcedony)

Polished/tumbled reddish agate (likely carnelian or banded chalcedony)

Chalcedony, microcrystalline SiO₂; exact variety is uncertain from the image

Tumbled brown agate (chalcedony)

Microcrystalline quartz, SiO₂; likely iron-stained chalcedony, though the photo alone cannot confirm agate banding

Polished orange agate beads

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

Agate (chalcedony), likely a cut nodule

Agate, a banded variety of microcrystalline quartz (SiO₂); associated iron oxides stain the rough outer matrix.

Tumbled jasper

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

Tumbled yellow jasper

Jasper, microcrystalline quartz (SiO₂) with iron-oxide inclusions

Agate

Cryptocrystalline quartz, SiO2

Tumbled yellow chalcedony (probable)

Chalcedony, microcrystalline quartz (SiO₂), possibly iron-stained jasper

Sardonyx or Carnelian Agate

Silicon Dioxide (SiO2) with iron impurities

Tumbled chalcedony (likely pale agate or quartz)

Chalcedony, microcrystalline SiO₂

Polished brecciated jasper

Microcrystalline quartz (SiO₂), likely iron-oxide-rich jasper

Gray chalcedony (microcrystalline quartz)

Chalcedony, SiO₂; a cryptocrystalline variety of quartz

Polished carnelian agate

Microcrystalline quartz (chalcedony), SiO₂; iron-oxide coloring

Polished yellow-orange stone pendant, possibly carnelian or yellow chalcedony

Chalcedony, microcrystalline quartz (SiO₂); identification from the photo is uncertain

Chalcedony (Agate)

Silicon Dioxide (SiO2)

Tumbled red-and-cream jasper

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

Tumbled brown agate (possible carnelian or chalcedony)

Microcrystalline quartz, SiO₂; agate is banded chalcedony

Chalcedony

Silicon Dioxide (SiO2)

Chalcedony Geode Tower

Silicon Dioxide (SiO2)

Polished jasper pebble, likely red/orange jasper

Microcrystalline quartz (SiO₂), opaque variety commonly colored by iron oxides

Tumbled orange-and-white chalcedony (likely carnelian agate)

Microcrystalline quartz, SiO₂; chalcedony colored by iron oxides

Yellow chalcedony (possibly iron-stained agate)

Microcrystalline quartz, SiO₂

Tumbled agate (possibly carnelian)

Microcrystalline quartz, SiO₂; likely chalcedony

Red jasper pebble

Jasper, an opaque, iron-oxide-colored variety of microcrystalline quartz (SiO₂)

Chalcedony (likely agate)

Microcrystalline quartz, SiO₂; agate is banded chalcedony

Light-colored agate (likely chalcedony)

Chalcedony, microcrystalline quartz (SiO₂); exact variety is uncertain from the image

Yellow Jasper

SiO2

Carnelian

Silicon dioxide (SiO2) with Iron Oxide impurities

Tumbled orange chalcedony or carnelian

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

Tumbled orange chalcedony or carnelian

Microcrystalline quartz (SiO₂), likely iron-stained chalcedony

Tumbled jasper (likely yellow/brown jasper)

Microcrystalline quartz, SiO₂, colored by iron oxides and other impurities

Tumbled translucent quartz or chalcedony fragment

Silicon dioxide, SiO₂; likely quartz/chalcedony

Tumbled brecciated jasper (likely)

Jasper, an opaque microcrystalline variety of quartz (SiO₂), with iron-oxide-rich zones

Lake Superior Agate

Silicon Dioxide (Chalcedony variety)

Red Chalcedony (likely dyed)

Chalcedony (a variety of Quartz), SiO2

Polished carnelian/chalcedony

Microcrystalline quartz (SiO₂), likely iron-stained chalcedony

Tumbled red-brown stone, likely jasper

Jasper, microcrystalline quartz (SiO₂), probably iron-oxide-bearing chert

Chalcedony with jasper (likely brecciated jasper)

Microcrystalline quartz, SiO₂, with iron-oxide-rich jasper fragments

Orange chalcedony or tumbled carnelian fragment

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

Agate

SiO2 (Silicon dioxide, chalcedony variety)

Milky Quartz

Silicon Dioxide (SiO2)

Red jasper (possible)

Microcrystalline quartz, SiO₂, colored red by iron oxides; the image alone cannot confirm the identification.