Mineral, Variety Of Chalcedony (Microcrystalline Quartz)

Red Jasper (beads)

SiO₂ (Silicon Dioxide)

Red jasper (likely)

Microcrystalline quartz, SiO₂, colored red by iron oxides

Quartz (Druzy) on Matrix

Silicon Dioxide (SiO2)

Jasper or Agate

Silicon dioxide (SiO2)

Tumbled chalcedony (possibly agate)

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

Red jasper (likely tumbled)

Microcrystalline quartz, chiefly SiO₂, colored red by iron oxides

Polished orbicular jasper

Microcrystalline quartz (SiO₂) with iron-rich and altered volcanic inclusions

Chalcedony

Silicon Dioxide (SiO2)

Jasper

Microcrystalline Quartz (SiO2)

Blue Chalcedony

Silicon Dioxide (SiO2)

Chalcedony (Agate / Chert)

Silicon Dioxide (SiO2)

Tumbled yellow jasper

Jasper, microcrystalline quartz (SiO₂) colored by iron oxides

Tumbled yellow jasper

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

Red Jasper

Silicon Dioxide (SiO2) - variety Jasper

Tumbled chalcedony (likely pale agate or quartz)

Chalcedony, microcrystalline SiO₂

Chalcedony

Silicon Dioxide (SiO2)

Jasper

Microcrystalline Quartz (SiO2)

Yellow jasper (likely iron-stained chalcedony)

Microcrystalline quartz, SiO₂, commonly colored by iron oxides/hydroxides

Tumbled chalcedony or quartz fragment

Microcrystalline quartz, SiO₂ (probable chalcedony)

Yellow Chalcedony

Silicon Dioxide (SiO2)

Brown chalcedony (agate-like flint/chert fragment)

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

Tumbled pink chalcedony (likely pink agate)

Chalcedony, microcrystalline SiO₂; variety of quartz

Polished agate geode slice

Microcrystalline quartz (chalcedony), SiO₂

Polished jasper pebble

Jasper (microcrystalline quartz, SiO₂)

Polished orbicular jasper (likely ocean jasper)

Silicified microcrystalline quartz (SiO₂), with iron-oxide and other mineral inclusions; exact variety cannot be confirmed from the image

Brown chalcedony (likely carnelian/agate)

Microcrystalline quartz, SiO₂; chalcedony variety

Iron-rich jasper (likely rough jasper/chert)

Microcrystalline quartz (SiO₂), colored by iron oxides

Jasper

SiO2 (Silicon Dioxide)

Polished brecciated jasper

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

Polished brecciated jasper (likely picture jasper)

Silica-rich microcrystalline quartz/chalcedony, SiO₂, with iron-oxide and clay inclusions

Polished banded agate (likely petrified wood)

Microcrystalline quartz (SiO₂); possibly silicified wood

Red jasper (likely)

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

Jasper

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

Brecciated Jasper

Silicon Dioxide (SiO2) with Hematite impurities

Jasper / Chert (river tumbled)

Microcrystalline Quartz (SiO2)

Blue Chalcedony

Silicon Dioxide (SiO2)

Blue agate (likely dyed and polished)

Microcrystalline quartz, SiO₂ (chalcedony); blue color may be dye

Yellow jasper (likely polished/tumbled)

Microcrystalline quartz, SiO₂, colored by iron oxides; exact identification is uncertain from the image

Tumbled carnelian

Carnelian, orange-red chalcedony (microcrystalline SiO₂)

Chalcedony

Silicon Dioxide (SiO2)

Jasper

SiO2 (Cryptocrystalline quartz)