Mineral (Variety Of Chalcedony)

Black Onyx

Silicon dioxide (SiO2) with parallel banded structure

Dyed Agate Slice

Silicon Dioxide (SiO2) with artificial colorants

Moss Agate

Silicon Dioxide (SiO2) with mineral inclusions of hornblende or chlorite

Moss Agate

Silicon Dioxide (SiO2) with inclusions of manganese or iron oxides

Carnelian

Carnelian (a variety of Chalcedony, which is a microcrystalline quartz, SiO2)

Tree Agate

Silicon Dioxide with Chlorite inclusions (SiO2)

Bloodstone / Heliotrope

Silicon dioxide (SiO2) with inclusions

Blue Lace Agate

Silicon Dioxide (SiO₂)

Red Jasper

Silicon Dioxide with Iron Oxide impurities (SiO2 + Fe2O3)

Red Jasper

Silicon Dioxide with Iron Oxide inclusions (SiO2 + Fe2O3)

Banded Agate (specifically Botryoidal/Orbicular Agate)

Silicon Dioxide (SiO2)

Red Jasper (beads)

SiO₂ (Silicon Dioxide)

Red Jasper or Iron-stained Quartz

SiO2 with Fe impurities

Tumbled chalcedony (likely agate)

Chalcedony, microcrystalline quartz (SiO₂); banding is not clearly visible to confirm agate

Polished gray chalcedony (likely agate)

Microcrystalline quartz, SiO₂; chalcedony, possibly banded agate

Tumbled brown jasper

Microcrystalline quartz (SiO₂), commonly called jasper

Red jasper (likely) bead bracelet

Jasper, an opaque variety of microcrystalline quartz; SiO₂

Agate

SiO2

Polished agate with possible iron-oxide inclusions

Microcrystalline quartz (chalcedony), SiO₂; inclusions appear to be iron oxides, possibly goethite or hematite

Orange carnelian (likely)

Chalcedony, microcrystalline quartz (SiO₂), colored by iron oxides

Red jasper (likely)

Microcrystalline quartz, SiO₂, colored red by iron oxides

Tumbled orange-brown chalcedony (likely carnelian)

Microcrystalline quartz, SiO₂; carnelian is iron-colored chalcedony

Tumbled orange-brown stone, likely carnelian or iron-stained chalcedony

Chalcedony (microcrystalline SiO₂), possibly iron-oxide-colored carnelian

Tumbled brown chalcedony (likely agate)

Microcrystalline quartz, SiO₂; agate is banded chalcedony

Chalcedony (Agate / Chert)

Silicon Dioxide (SiO2)

Polished agate or chalcedony pebble

Microcrystalline quartz (SiO₂), likely agate/chalcedony

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

Tumbled chalcedony (likely agate)

Microcrystalline quartz, SiO₂; possibly iron-stained chalcedony

Tumbled yellow-brown jasper

Microcrystalline quartz (SiO₂), commonly called jasper; exact variety cannot be confirmed from the image

Brown jasper pebble

Microcrystalline quartz (SiO₂), commonly iron-oxide stained

Tumbled brecciated jasper

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

Tumbled brown jasper (likely)

Microcrystalline quartz, SiO₂; likely iron-oxide-stained jasper

Tumbled chalcedony (possibly agate)

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

Jasper

SiO2

Iron-rich jasper (likely rough jasper/chert)

Microcrystalline quartz (SiO₂), colored by iron oxides

Red agate (possibly dyed chalcedony)

Chalcedony, microcrystalline SiO₂; agate is banded chalcedony

Jasper

Silicon dioxide (SiO2)

Tumbled honey-brown chalcedony (likely agate)

Microcrystalline quartz, SiO₂; chalcedony, possibly iron-stained agate

Likely tumbled brown agate

Microcrystalline quartz (SiO₂), commonly chalcedony; exact identification is uncertain from the image

Chalcedony

Silicon Dioxide (SiO2)

Chalcedony (Agate)

Chalcedony (Cryptocrystalline Quartz, SiO2)

Brown chalcedony (likely carnelian/agate)

Microcrystalline quartz, SiO₂; chalcedony variety