Mineral (Variety Of Chalcedony)

Polished pink agate/chalcedony pebble

Chalcedony (microcrystalline quartz, SiO₂), likely iron-stained agate

Tumbled yellow jasper

Jasper, microcrystalline quartz (SiO₂) colored by iron oxides

Tumbled carnelian (orange chalcedony)

Carnelian, a microcrystalline variety of quartz; silicon dioxide (SiO₂) colored mainly by iron oxides

Tumbled jasper or jasper-rich chert

Microcrystalline quartz (SiO₂) with iron-oxide impurities

Tumbled jasper (likely brecciated or orbicular jasper)

Microcrystalline quartz/chalcedony, SiO₂, with iron-oxide inclusions

Polished/tumbled agate (likely carnelian or iron-stained chalcedony)

Microcrystalline quartz, SiO₂; chalcedony with iron-oxide inclusions

Red Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Banded Agate (Chert/Chalcedony)

Silicon Dioxide (SiO2)

Green agate/geode slab

Cryptocrystalline quartz (chalcedony), SiO₂, likely agate with druzy quartz

Agate

Chalcedony (SiO2) with impurities

Banded Agate

Silicon dioxide (SiO2) - variety of Chalcedony

Ocean Jasper or Orbicular Jasper

SiO2

Agate

Silicon dioxide (SiO2)

Likely polished agate beads

Agate, a banded variety of chalcedony (microcrystalline SiO₂); exact identification is uncertain from the image

Tumbled jasper (likely)

Microcrystalline quartz, SiO₂; likely jasper, a variety of chalcedony

Carnelian (orange chalcedony)

Microcrystalline quartz, SiO₂; chalcedony colored mainly by iron oxides

Tumbled brown chalcedony or jasper

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

Banded Calcite

Calcite (Calcium Carbonate, CaCO3)

Polished red jasper

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

Polished agate (likely carnelian/chalcedony)

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

Polished agate (likely chalcedony)

Microcrystalline quartz, SiO₂; agate is banded chalcedony

Red jasper pebbles

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

Polished agate or chalcedony pebble

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

Polished pink and brown agate

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

Brown tumbled stone, possibly jasper

Uncertain from the image; likely iron-rich microcrystalline quartz (SiO₂), commonly called jasper

Tumbled brown jasper

Microcrystalline quartz (SiO₂), commonly called jasper when opaque and impurity-colored

Dyed agate slice

Microcrystalline quartz (SiO₂), typically banded chalcedony

Tumbled jasper (likely brecciated or red jasper)

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

Polished red jasper (likely brecciated or orbicular jasper)

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

Tumbled reddish-brown stone, possibly jasper or quartzite

Uncertain; likely microcrystalline quartz (SiO₂), potentially iron-stained jasper

Tumbled banded agate

Microcrystalline quartz (chalcedony), SiO₂, with iron-oxide and other trace-coloring inclusions

Polished orange agate or chalcedony

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

Tumbled carnelian (likely)

Orange-red chalcedony, microcrystalline quartz (SiO₂)

Yellow Chalcedony (Agate/Carnelian)

Silicon Dioxide (SiO2)

Gray Agate

Cryptocrystalline Quartz (SiO2)

Agate

SiO2

Polished brecciated jasper (likely)

Jasper, microcrystalline quartz (SiO₂), with contrasting mineral fragments or veins

Polished brown jasper (probable ocean jasper or iron-rich jasper)

Microcrystalline quartz/chalcedony, SiO₂, colored by iron oxides and other inclusions

Tumbled brown jasper

Jasper, microcrystalline quartz (SiO₂), commonly with iron-oxide impurities

Quartz (Chalcedony/Agate)

Silicon Dioxide (SiO2)

Polished brown agate (likely carnelian/chalcedony)

Microcrystalline quartz, SiO₂; chalcedony with iron-oxide coloration

Tumbled jasper (likely picture jasper or iron-rich jasper)

Microcrystalline quartz/chalcedony, SiO₂, colored by iron oxides