Mineral, Variety Of Chalcedony (Microcrystalline Quartz)

Jasper

Silicon dioxide (SiO2) with impurities

Brecciated jasper

Chalcedony–quartz aggregate, predominantly SiO₂, with iron-oxide coloring

Tumbled red jasper (likely)

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

Reddish-brown jasper/chert with iron staining

Microcrystalline quartz (SiO₂), likely ferruginous jasper or chert

Tumbled carnelian

Carnelian, a red-orange cryptocrystalline chalcedony (SiO₂)

Polished carnelian

Cryptocrystalline chalcedony (SiO₂), orange-red variety colored mainly by iron oxides

Polished agate (likely Botswana or plume agate)

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

Chalcedony (possibly lavender or gray agate)

Microcrystalline quartz, SiO₂; fibrous quartz aggregate

Jasper (likely Brecciated or Multi-colored)

Jasper (SiO2)

Milky chalcedony cabochon ring

Chalcedony, microcrystalline quartz (SiO₂), likely white or pale agate variety

Red Jasper

Jasper (Silica with Iron Oxide inclusions), SiO2

Carnelian (a variety of Chalcedony)

SiO2 (Silicon Dioxide) with Iron Oxide impurities

Blue chalcedony or blue quartz bead bracelet

Microcrystalline quartz, SiO₂ (chalcedony); possibly treated blue quartz

Tumbled chalcedony or jasper

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

Tumbled amber-colored chalcedony (likely carnelian)

Microcrystalline quartz, SiO₂; orange-red variety commonly termed carnelian

Banded agate (chalcedony)

Agate, a banded variety of microcrystalline quartz (SiO₂)

Polished carnelian/chalcedony

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

Polished jasper pendant

Jasper, an opaque microcrystalline variety of quartz (SiO₂); exact variety cannot be confirmed from the image

Polished jasper pebble

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

Tumbled orange chalcedony or carnelian

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

Tumbled carnelian (orange chalcedony)

Carnelian, a microcrystalline variety of quartz; silicon dioxide (SiO₂) colored mainly by iron oxides

Ocean Jasper

Orbicular Jasper (variety of Chalcedony/Quartz, SiO2)

Banded chert (likely flint)

Microcrystalline quartz/chalcedony, SiO₂

Tumbled yellow-orange chalcedony (possibly yellow jasper)

Microcrystalline quartz, SiO₂; chalcedony with iron-oxide coloration

Tumbled banded agate

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

Black Onyx (Tumbled)

Silicon Dioxide (SiO2)

Carnelian

Carnelian (Silicon Dioxide - SiO2)

Quartz pebble (Agate / Chalcedony)

Silicon Dioxide (SiO2)

Polished banded agate

Agate, a banded variety of chalcedony (microcrystalline SiO₂)

Agate

Silicon Dioxide (SiO2) - Chalcedony variety

Polished River Jasper

Silicon Dioxide (SiO2) with iron and other mineral inclusions

Chalcedony

Silicon Dioxide (SiO2)

Jasper

Silicon Dioxide (SiO2)

Polished carnelian agate

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

Iron-stained Quartz

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Polished agate geode slice

Chalcedony (microcrystalline quartz, SiO₂), banded agate variety

Tumbled blue-gray stone, possibly chalcedony or quartzite

Likely microcrystalline quartz (SiO₂), but the image is insufficient for confident identification

Polished blue-banded agate slice

Agate (microcrystalline quartz, SiO₂; chiefly chalcedony)

Agate (Carnelian-like)

Chalcedony (Silicon Dioxide, SiO2)

Carnelian

Quartz (Variety: Chalcedony, SiO2)

Ocean Jasper

Orbicular Jasper (Silicon Dioxide, SiO2)

Tumbled jasper or iron-rich chert

Microcrystalline quartz (SiO₂) with iron-oxide inclusions