Mineral_variety_of_chalcedony

Tumbled jasper or chert

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

Tumbled chalcedony/agate (likely iron-stained quartz)

Microcrystalline quartz, SiO₂; chalcedony with possible agate banding and iron-oxide inclusions

Chalcedony Geode Fragment

Silicon Dioxide (SiO2)

Polished jasper pebble

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

Tumbled amber-colored chalcedony (likely carnelian)

Quartz, microcrystalline SiO₂; orange variety commonly called carnelian

Chalcedony

Silicon Dioxide (SiO2)

Chalcedony

Silicon Dioxide (SiO2)

Flower Agate

Silicon Dioxide (SiO2) with Chalcedony inclusions

Tumbled brown chalcedony (likely carnelian/agatesque material)

Microcrystalline quartz, SiO₂; chalcedony variety

Brecciated Jasper

Silicon Dioxide (SiO2) with Hematite impurities

Polished agate beads

Agate, a banded variety of chalcedony (microcrystalline quartz, SiO₂)

Jasper (likely brecciated jasper)

Microcrystalline quartz/chalcedony, SiO₂, colored by iron oxides

Polished chalcedony (likely moss or dendritic agate)

Microcrystalline quartz, SiO₂, with iron/manganese oxide inclusions

Red jasper

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

Chalcedony

Silicon dioxide (SiO2) - Cryptocrystalline Quartz

Chalcedony

Silicon Dioxide (SiO2)

Blue Agate (Dyed or Treated Chalcedony)

Silicon Dioxide (SiO2), microcrystalline quartz variety

Polished carnelian jasper / brecciated jasper

Microcrystalline quartz (SiO₂), chalcedony with iron-oxide pigments and opaque jasper fragments

Banded Calcite (Mexican Onyx)

Calcium Carbonate (CaCO3)

Tumbled honey-brown chalcedony (likely common quartz)

Microcrystalline quartz, SiO₂; possibly iron-stained chalcedony or low-grade agate

Tumbled agate or chalcedony

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

Polished agate/jasper pebble

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

Polished carnelian/chalcedony

Microcrystalline quartz (SiO₂), likely iron-stained chalcedony

Tumbled yellow jasper or chalcedony

Microcrystalline quartz, SiO₂; likely iron-oxide-bearing jasper/chalcedony

Chalcedony (Agate)

Chalcedony (Cryptocrystalline Quartz, SiO2)

Tumbled amber-colored chalcedony or jasper

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

Polished jasper pebble (possibly orbicular jasper)

Microcrystalline quartz (SiO₂), likely jasper; exact variety cannot be confirmed visually

Polished banded agate (likely carnelian agate)

Microcrystalline quartz, SiO₂ (chalcedony); iron-oxide coloring

Tumbled blue chalcedony (likely common blue quartz)

Microcrystalline quartz, SiO₂; chalcedony variety

Tumbled brown chalcedony or jasper

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

Polished banded jasper (likely red jasper)

Microcrystalline quartz/chalcedony, SiO₂, colored by iron oxides; exact variety uncertain

Tumbled brown jasper

Microcrystalline quartz (chalcedony), SiO₂; likely jasper

Tumbled agate/chalcedony

Microcrystalline quartz (SiO₂), likely banded chalcedony or agate

Tumbled agate and chalcedony specimens

Microcrystalline quartz (SiO₂), chiefly chalcedony/agate

Tumbled orange chalcedony (likely carnelian)

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

Chalcedony

Silicon Dioxide (SiO₂)

Chalcedony

Silicon Dioxide (SiO2)

Chalcedony (Banded/Mottled Variety)

Chalcedony (a cryptocrystalline variety of Quartz, SiO2)

Tumbled yellow jasper (probable)

Microcrystalline quartz/chalcedony, SiO₂, colored by iron oxides

Tumbled jasper (likely red/brown jasper)

Microcrystalline quartz/chalcedony, SiO₂, colored by iron oxides

Red Jasper

Silicon Dioxide (SiO2) - variety Jasper

Chalcedony

Silicon Dioxide (SiO2)