Mineral (Chalcedony Variety)

Carnelian

Carnelian (SiO2 with Iron oxide impurities)

Red Jasper or Iron-stained Quartz

SiO2 with Fe impurities

Agate

SiO2

Red jasper (likely)

Microcrystalline quartz, SiO₂, colored red by iron oxides

Chalcedony (Agate / Chert)

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

Iron-rich jasper (likely rough jasper/chert)

Microcrystalline quartz (SiO₂), colored by iron oxides

Tumbled chalcedony (possibly agate)

Microcrystalline quartz, SiO₂ (chalcedony); banding is not clearly visible to confirm agate

Jasper

SiO2

Chalcedony (Agate)

Chalcedony (Cryptocrystalline Quartz, SiO2)

Brown chalcedony (likely carnelian/agate)

Microcrystalline quartz, SiO₂; chalcedony variety

Jasper

SiO2 (Cryptocrystalline quartz)

Orange-pink chalcedony (likely carnelian/chalcedony rough)

Microcrystalline quartz, SiO₂; iron-oxide-bearing chalcedony

Jasper

Silicon dioxide (SiO2)

Brecciated Jasper

Silicon Dioxide (SiO2) with Hematite impurities

Jasper

Chalcedony (SiO2)

Polished jasper-like stone

Likely chalcedony (microcrystalline quartz, SiO₂), possibly brecciated jasper

Tumbled carnelian agate

Carnelian, a reddish-orange variety of chalcedony (microcrystalline quartz, SiO₂)

Jasper or Agate

Silicon dioxide (SiO2)

Red jasper (probable)

Jasper, an opaque microcrystalline variety of quartz; SiO₂, commonly colored by iron oxides

Polished orange jasper

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

Polished agate geode slice

Microcrystalline quartz (chalcedony), SiO₂

Polished jasper pebble

Jasper (microcrystalline quartz, SiO₂)

Blue Lace Agate (or similar Chalcedony)

SiO2 (Silicon Dioxide)

Tumbled brown agate (likely carnelian/chalcedony)

Microcrystalline quartz, SiO₂; chalcedony, possibly iron-stained

Polished orange agate (likely carnelian)

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

Chalcedony (Agate/Carnelian)

Silicon Dioxide (SiO2)

Jasper

Microcrystalline Quartz (SiO2)

Agate

Agate (Chalcedony), SiO2

Tumbled chalcedony (likely orange agate/carnelian)

Microcrystalline quartz, SiO₂; chalcedony with iron-oxide coloration

Polished honey/brown agate (likely carnelian chalcedony)

Microcrystalline quartz, SiO₂; chalcedony with iron-oxide coloration

Jasper

Chalcedony (SiO2)

Yellow jasper carving

Jasper, an opaque microcrystalline variety of quartz (SiO₂), shaped as a butterfly

Tumbled yellow-orange chalcedony (likely carnelian or honey agate)

Microcrystalline quartz, SiO₂; orange coloration commonly from iron oxides

Brown chalcedony (possibly carnelian)

Microcrystalline quartz, SiO₂; carnelian is orange-red chalcedony

Tumbled orange chalcedony

Chalcedony (microcrystalline quartz, SiO₂), likely orange carnelian

Tumbled pale agate or chalcedony

Microcrystalline quartz (SiO₂), likely agate/chalcedony

Agate

Cryptocrystalline quartz (SiO2)

Tumbled pink chalcedony (likely pink agate)

Chalcedony, microcrystalline SiO₂; variety of quartz

Brown chalcedony (likely agate)

Microcrystalline quartz, SiO₂; chalcedony, possibly banded agate

Jasper

Silicon dioxide, SiO2

Chalcedony

Silicon Dioxide (SiO2)