Mineral (Variety Of Chalcedony)

Tumbled agate (chalcedony)

Microcrystalline quartz, SiO₂; likely translucent gray-and-white chalcedony with agate-like banding

Green-gray banded agate (likely polished chalcedony)

Chalcedony, microcrystalline quartz (SiO₂); banding may be quartz-filled fractures

Red jasper (likely)

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

Tumbled carnelian (likely)

Cryptocrystalline quartz, SiO₂; reddish chalcedony colored mainly by iron oxides

Tumbled brown agate (probable)

Microcrystalline quartz, SiO₂ (chalcedony/agate)

Tumbled orange chalcedony (probable carnelian)

Cryptocrystalline quartz, SiO₂; reddish-orange variety commonly called carnelian

Tumbled red jasper (likely)

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

Tumbled jasper

Microcrystalline quartz (SiO₂), commonly iron-oxide-bearing chalcedony

Polished agate/geode fragment

Microcrystalline quartz (chalcedony), SiO₂, with possible calcite or quartz cavity lining

Polished agate (likely moss or plume agate)

Microcrystalline quartz (SiO₂), chalcedony variety; exact variety is uncertain from the photo

Tumbled brown agate/chalcedony (probable)

Microcrystalline quartz, SiO₂; likely iron-stained agate or jasper

Polished jasper (likely brecciated or scenic jasper)

Microcrystalline quartz/chalcedony, SiO₂, with iron-oxide and other mineral inclusions

Dendritic Agate or Moss Agate Nodules (Septarian-like)

Chalcedony with mineral inclusions (SiO2)

Chalcedony (Agate)

Cryptocrystalline Quartz (SiO2)

Agate (or Chalcedony)

Silicon Dioxide (SiO2)

Blue Lace Agate

Cryptocrystalline variety of Quartz (SiO2)

Green chalcedony (likely agate) earrings

Chalcedony, microcrystalline quartz (SiO₂)

Agate

Silicon dioxide (SiO2)

Tumbled amber-colored chalcedony (likely carnelian)

Quartz, microcrystalline SiO₂; orange variety commonly called carnelian

Carnelian (Chalcedony)

Silicon Dioxide (SiO2) - variety of Chalcedony

Blue chalcedony (beaded bracelet)

Chalcedony, microcrystalline quartz (SiO₂)

Tumbled jasper (likely picture/brecciated jasper)

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

Chalcedony Geode Fragment

Silicon Dioxide (SiO2)

Polished banded agate pendant

Agate, microcrystalline quartz (SiO₂), a chalcedony variety

Tumbled blue chalcedony/agate (likely glassy silica material)

Microcrystalline quartz, SiO₂; possibly blue chalcedony or dyed agate

Yellow Jasper

Tectosilicates (SiO2) with Goethite/Iron oxide inclusions

Yellow Jasper

Jasper (Silicon Dioxide, SiO2)

Tumbled brown jasper

Microcrystalline quartz (chalcedony), chiefly SiO₂, with iron-oxide impurities

Polished jasper pebble

Microcrystalline quartz (chalcedony), chiefly SiO₂, with iron-oxide impurities

Agate

Silicon dioxide (chalcedony), SiO2

Agate

Silicon dioxide (SiO2)

Agate

Silicon Dioxide (SiO2)

Tumbled dark reddish-brown stone, possibly red jasper

Jasper, microcrystalline quartz (SiO₂), likely iron-oxide colored

Banded agate (rough fragment)

Microcrystalline quartz, SiO₂ (chalcedony); banding may include iron-oxide coloration

Tumbled agate (likely)

Microcrystalline quartz, SiO₂; agate is banded chalcedony

Polished brecciated jasper

Microcrystalline quartz (SiO₂), with iron-oxide staining

Tumbled brown agate (chalcedony)

Microcrystalline quartz, SiO₂; likely iron-stained chalcedony

Jasper or Agate Nodule

SiO2

Polished carnelian

Carnelian, a reddish-orange cryptocrystalline chalcedony (SiO₂), colored mainly by iron oxides.

Orange-red jasper pebble

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

Tumbled orange chalcedony (likely carnelian)

Cryptocrystalline quartz, SiO₂; orange variety commonly called carnelian

Raw orange chalcedony (carnelian-like)

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