Mineral (Variety Of Chalcedony)

Yellow Chalcedony (Agate/Carnelian)

Silicon Dioxide (SiO2)

Gray Agate

Cryptocrystalline Quartz (SiO2)

Agate

SiO2

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

Microcrystalline quartz/chalcedony, SiO₂, colored by iron oxides

Green agate/geode slab

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

Tumbled red jasper

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

Tumbled chalcedony (likely carnelian or common agate)

Microcrystalline quartz, SiO₂; chalcedony variety

Polished banded agate (likely carnelian and black agate)

Chalcedony, microcrystalline quartz (SiO₂), with iron-oxide coloration

Chalcedony (probably agate or common quartz)

Microcrystalline quartz, SiO₂

Agate (or Chalcedony)

Silicon Dioxide (SiO2)

Tumbled brown chalcedony or jasper

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

Banded Calcite

Calcite (Calcium Carbonate, CaCO3)

Tumbled agate or chalcedony pebble

Microcrystalline quartz (SiO₂), likely agate/chalcedony

Orange chalcedony (possibly carnelian)

Microcrystalline quartz, SiO₂; iron-oxide-bearing chalcedony

Honey/brown agate (chalcedony)

Microcrystalline quartz, SiO₂; likely translucent agate or chalcedony

Polished brown agate (likely carnelian/chalcedony)

Microcrystalline quartz, SiO₂; chalcedony with iron-oxide coloration

Tumbled agate or chalcedony (probable)

Microcrystalline quartz, SiO₂

Agate

Silicon dioxide (SiO2)

Carnelian (Chalcedony)

Silicon Dioxide (SiO2) - variety of Chalcedony

Tumbled jasper (likely)

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

Blue Lace Agate

Cryptocrystalline variety of Quartz (SiO2)

Banded Calcite (often sold as Orange Onyx or Mexican Onyx)

Calcium Carbonate (CaCO3)

Dendritic Agate or Moss Agate Nodules (Septarian-like)

Chalcedony with mineral inclusions (SiO2)

Tumbled jasper (likely brown jasper)

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

Red Jasper

Jasper (Silicate mineral - SiO2)

Agate

Agate (Silicon Dioxide, SiO2)

Banded Agate

Agate (Silicon Dioxide - SiO2)

Agate

Chalcedony (SiO2) with impurities

Agate

Silicon Dioxide (SiO2)

Carnelian

Carnelian (SiO2)

Tumbled orange-and-white jasper or brecciated chalcedony

Microcrystalline quartz (SiO₂), likely iron-oxide-stained jasper; exact variety cannot be confirmed from the image

Polished brown jasper (likely brecciated or orbicular jasper)

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

Polished red jasper

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

Polished brecciated jasper

Silica-rich microcrystalline quartz/chalcedony (SiO₂), with iron-oxide staining and angular mineral fragments

Tumbled banded agate (likely carnelian or sardonyx)

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

Tumbled brown jasper

Microcrystalline quartz (SiO₂), commonly with iron-oxide impurities

Jasper with Iron Oxides

Silicon Dioxide (SiO2) with Fe2O3 inclusions

Small orange-red tumbled gemstones, likely carnelian

Carnelian, a microcrystalline variety of quartz (SiO₂), typically colored by iron oxides

Jasper

Jasper (Silicon Dioxide, SiO2)

Red Jasper (Chert)

Silicon Dioxide (SiO2) with iron inclusions

Red Jasper

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Tumbled brown chalcedony (likely smoky quartz or agate)

Chalcedony, microcrystalline SiO₂; exact variety cannot be confirmed visually