Mineral (Specifically A Variety Of Chalcedony, Which Is Microcrystalline Quartz)

Tumbled red jasper

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

Chert (and Flint)

Silicon Dioxide (SiO2)

Jasper with Chalcedony

Silicon Dioxide (SiO2)

Raw orange chalcedony (carnelian-like)

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

Green Banded Agate

Agate (Variety of Chalcedony/Quartz), SiO2

Agate (Chalcedony)

Silicon Dioxide (SiO2)

Chert (specifically Novaculite)

Microcrystalline Quartz (SiO2)

Ocean Jasper (Orbicular Jasper)

Silicon Dioxide (SiO2)

Polished agate/geode fragment

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

Red Agate

Agate (Cryptocrystalline variety of Quartz, SiO2)

Ocean Jasper (Orbicular Jasper)

Silicon Dioxide (SiO2) with iron and other mineral inclusions

Quartz (Chert/Chalcedony variety)

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide - SiO2)

Carnelian (orange chalcedony)

Cryptocrystalline quartz, SiO₂; orange variety of chalcedony

Agate (specifically Chalcedony/Banded Agate)

Silicon Dioxide (SiO2)

Banded Calcite (Mexican Onyx)

Banded Calcite (CaCO3)

Carnelian

Carnelian (SiO2 - Silicon Dioxide)

Tumbled carnelian/chalcedony

Chalcedony (microcrystalline quartz), SiO₂; reddish color from iron oxides

Polished carnelian (likely brecciated agate) heart

Microcrystalline quartz, SiO₂; chalcedony with iron-oxide coloration

Tumbled jasper (likely picture jasper)

Jasper, an opaque microcrystalline variety of quartz (SiO₂); exact variety uncertain from the photo

Chert (Jasper variety)

Microcrystalline Quartz (SiO2)

Jasper

Silicon dioxide (SiO2)

Chert (specifically Red Chert or Jasper)

Microcrystalline Quartz (SiO2)

Red Jasper

Silicon Dioxide (SiO2) with Hematite (Fe2O3) inclusions

Red Jasper

Jasper (a variety of Chalcedony, SiO₂ with iron oxide inclusions)

Orange cabochon ring

Possibly carnelian (microcrystalline quartz, SiO₂); identification from the photograph is uncertain.

Tumbled red jasper

Jasper, microcrystalline quartz (SiO₂) colored by iron oxides

Polished brecciated jasper

Jasper; microcrystalline quartz (SiO₂) with iron-oxide staining and dark mineral fragments

Tumbled brown chalcedony (likely chert or agate)

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

Bloodstone

Chalcedony quartz variety (SiO2) with inclusions

Blue Lace Agate

Chalcedony (cryptocrystalline variety of Quartz), SiO2

Carved jasper bear figurine

Jasper, microcrystalline quartz (SiO₂), likely brecciated or orbicular jasper

Red jasper (likely brecciated jasper)

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

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 (Chalcedony)

Silicon Dioxide (SiO2) with iron oxide inclusions

Polished/tumbled brown-and-white jasper

Microcrystalline quartz (SiO₂), commonly called jasper; likely brecciated or banded jasper

Tumbled yellow-orange chalcedony (likely carnelian or honey agate)

Microcrystalline quartz, SiO₂; orange coloration commonly from iron oxides

Tumbled yellow chalcedony (likely yellow jasper or quartz)

Microcrystalline quartz, SiO₂; probable chalcedony/jasper variety

Polished carnelian agate

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

Polished red jasper beads

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

Raw Green Jasper

Silicon Dioxide (SiO2) with iron silicate inclusions