Mineral, Variety Of Chalcedony (Microcrystalline Quartz)

Tumbled green jasper (probable)

Jasper, opaque microcrystalline quartz (SiO₂), colored by iron and other impurities

Red jasper fragment

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

Polished brown-and-cream jasper

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

Tumbled brown chalcedony (likely carnelian or jasper)

Microcrystalline quartz, SiO₂ (chalcedony variety)

Tumbled blue chalcedony (likely common blue quartz)

Microcrystalline quartz, SiO₂; chalcedony variety

Blue-dyed banded agate

Microcrystalline quartz (SiO₂), chalcedony variety

Blue lace agate (tumbled)

Microcrystalline quartz, SiO₂ (chalcedony variety)

Tumbled Red Jasper

Quartz (Microcrystalline variety of chalcedony, SiO2)

Polished red jasper pebble

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

Jasper and Mixed River Pebbles

Microcrystalline Quartz (Chalcedony / Jasper)

Polished plume agate

Microcrystalline quartz (SiO₂), variety of chalcedony

Tumbled amber-colored quartz/chalcedony (likely carnelian or honey agate)

Microcrystalline quartz, SiO₂; coloration may derive from iron oxides

Polished agate slice

Agate, a banded variety of chalcedony (microcrystalline SiO₂)

Tumbled amber-colored chalcedony or jasper

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

Tumbled orange chalcedony (likely carnelian)

Microcrystalline quartz, SiO₂; iron-bearing variety commonly termed carnelian

Honey-colored chalcedony (likely carnelian)

Microcrystalline quartz, SiO₂; orange chalcedony colored by iron oxides

Tumbled banded agate (likely blue lace agate)

Microcrystalline quartz, SiO₂ (chalcedony variety)

Blue chalcedony (likely dyed or polished)

Microcrystalline quartz, SiO₂ (chalcedony variety)

Tumbled chalcedony (likely brown-yellow jasper or agate)

Microcrystalline quartz (SiO₂), chalcedony variety

Blue chalcedony (likely common blue agate)

Microcrystalline quartz, SiO₂; chalcedony variety

Gray Agate with Druzy Quartz Geode

Cryptocrystalline Quartz (SiO2)

Polished carnelian/chalcedony

Microcrystalline quartz (SiO₂), likely iron-stained chalcedony

Agate Geode

Silicon Dioxide (SiO2) - Chalcedony variety

Polished agate or chalcedony pebble

Microcrystalline quartz (SiO₂), likely chalcedony/agate

Chalcedony (likely carnelian/agate beads or rounded grains)

Microcrystalline quartz, SiO₂; chalcedony varieties

Chalcedony (Agate Nodule)

Silicon Dioxide (SiO2)

Polished brecciated jasper

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

Polished agate (likely carnelian or dyed red agate)

Chalcedony, microcrystalline quartz (SiO₂)

Tumbled banded agate

Chalcedony (microcrystalline quartz), SiO₂

Likely tumbled carnelian or orange chalcedony

Microcrystalline quartz, SiO₂ (chalcedony variety)

Red jasper (likely brecciated or orbicular jasper)

Microcrystalline quartz, SiO₂, colored mainly by iron oxides

Brecciated jasper (likely ocean jasper or red jasper)

Microcrystalline quartz, SiO₂, with iron-oxide pigments and breccia cement

Red Jasper

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Blue Chalcedony

Silicon Dioxide (SiO2)

Tumbled jasper or chalcedony pebble

Microcrystalline quartz, SiO₂ (likely jasper/chalcedony)

Polished jasper pebble

Microcrystalline quartz (chalcedony), SiO₂, with iron-oxide inclusions

Agate Geode Nodule

Chalcedony / Quartz (SiO2)

Carnelian

Carnelian (a variety of Chalcedony) - SiO2

Chalcedony in Matrix

Silicon Dioxide (SiO2)

Polished brecciated jasper (likely)

Microcrystalline quartz, SiO₂, with iron-oxide-rich brown fragments and pale silica

Tumbled gray-blue agate/chalcedony

Microcrystalline quartz (SiO₂), likely banded chalcedony or agate

Tumbled banded agate

Chalcedony (microcrystalline quartz), SiO₂