Mineral (Chalcedony Variety)

Tumbled red jasper (probable)

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

Tumbled jasper

Microcrystalline quartz (SiO₂), commonly iron-rich jasper

Tumbled carnelian/chalcedony

Microcrystalline quartz (SiO₂), likely iron-stained chalcedony

Red jasper (likely brecciated jasper)

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

Red Jasper

Silicon Dioxide with Hematite impurities (SiO2 + Fe2O3)

Dendritic Agate (Tumbled)

Silicon Dioxide (SiO2) with inclusions

Agate (Sliced and Carved)

Silicon Dioxide (SiO2) - Banded Chalcedony

Red Jasper (Tumbled)

Silicon Dioxide (SiO2) with iron oxide inclusions

Ocean Jasper

SiO2, highly silicified rhyolite or spherulitic chalcedony

Yellow Agate (Chalcedony)

Silicon Dioxide (SiO2)

Blue Dyed Agate Geode (Slice)

Silicon Dioxide (SiO2) - Chalcedony / Quartz

Yellow Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Agate (Chalcedony)

Agate (Silicon Dioxide - SiO2)

Red Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Banded Agate (specifically Botswana Agate appearance)

Silicon Dioxide (SiO2)

Green Jasper

Silicon Dioxide (SiO2) with iron silicate inclusions

Tumbled red jasper

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

Red jasper (likely rough jasper/chert)

Microcrystalline quartz (SiO₂), commonly colored by iron oxides

Tumbled banded calcite (often sold as “onyx” or green onyx)

Calcite, CaCO₃; commonly banded cave/travertine calcite

Red jasper pebble

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

Tumbled Gray Agate

Silicon Dioxide (SiO2)

Jasper

Silicon Dioxide (SiO2) with impurities

Blue Agate (likely dyed)

Silicon Dioxide (SiO2)

Red Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Tumbled yellow quartz (likely citrine or yellow chalcedony)

Quartz, SiO₂; variety uncertain from image

Yellow Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Likely polished/tumbled quartz-rich specimen

Quartz, silicon dioxide (SiO₂), possibly an agate or chalcedony variety

Jasper (Cream/Yellow variety)

Silicon dioxide (SiO2)

Botryoidal Chalcedony (Quartz Var.)

Silicon Dioxide (SiO2)

Polished agate/chalcedony pebble

Microcrystalline quartz (SiO₂), likely brecciated or mossy agate

Red-and-gray jasper (likely orbicular or brecciated jasper)

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

Polished red jasper (likely hematite-bearing jasper)

Jasper, microcrystalline quartz (SiO₂), colored chiefly by iron oxides such as hematite/goethite

Red Jasper

Silicon Dioxide (SiO2) with Iron impurities

Red Jasper

Jasper (Silicon Dioxide with Iron Oxide inclusions, SiO2 + Fe2O3)

Red Jasper (Quartzite)

Silicon Dioxide (SiO2) with iron oxide inclusions

Agate

Agate (Silicon Dioxide - SiO2)

Blue Lace Agate

Silicon Dioxide (SiO2)

Flower Agate (Cherry Blossom Agate)

Chalcedony (Silicon Dioxide) with Opaque Inclusions - SiO2

Jasper

Jasper (Silicon Dioxide, SiO2)

Agate (or Chalcedony)

SiO2 (Silicon Dioxide) - a cryptocrystalline variety of quartz

Blue Chalcedony

Chalcedony (Silicon Dioxide, SiO2)

Chalcedony (Agate/Carnelian variety)

Cryptocrystalline Quartz (SiO2)